Ask The Experts

The Android Repair Guide to Fixing Boot Problems

Kannon Yamada 11-11-2015

Is your Android device not booting up? It could be because of hardware, software, or firmware error. This week, Kannon Yamada explains how to diagnose startup problems for unmodified Android devices, and how to fix them.


A Reader Asks:

My Android smartphone doesn’t work. How can I fix it?

First something went wrong when I tried to update my smartphone to the newest version of Android. It got stuck in a boot-loop. Searching online, I found that I need to flash it with a new ROM (short for Read Only Memory).

However the ROM flashing program on my computer could not find my phone, even though it can be recognized (as an Android phone) within Windows Device Manager. Is there any way to repair my phone, or should I be hunting for a new one?

Kannon’s Reply:

My recommendation: Use the phone’s recovery or bootloader first instead of attempting to install a custom ROM (what’s a custom ROM? What Is Rooting? What Are Custom ROMs? Learn Android Lingo Ever had a question about your Android device, but the answer had a bunch of words in it that you didn't understand? Let us break down the confusing Android lingo for you. Read More ). Installing a custom ROM can permanently brick your device (avoid Android bricks 6 Key Tips To Avoid Bricking Your Rooted Android Device When you own a rooted Android phone running a custom ROM, you need to take some precautions or risk "bricking" (destroying) your device. Read More ). For those curious, MakeUseOf offers an Android Root guide The Complete Guide to Rooting Your Android Phone or Tablet So, you want to root your Android device? Here's everything you need to know. Read More along with several Android root tutorials.

The troubleshooting outline contained here will not deal with installing custom ROMs. Nor will it include detailed instructions for those of you who decided to install a custom ROM on their device. There are just too many variables that could go wrong. It instead deals with the symptoms that different kinds of unbootable devices display, and how to repair those issues.


A Note to the Reader

The reader asking the question suffers from two separate issues: The first is that Windows fails to recognize the phone using Android Debug Bridge (ADB) drivers. The second: The phone suffers from a failed Over-the-Air (OTA) update, which induced a boot loop. I address both of these issues separately, really under “Unbootable Scenario #3″ and the Minimal Fastboot and ADB program, under “What are the Android Tools for Recovery?“.

Some additional concerns: You probably don’t have access to a custom recovery, like TWRP or ClockWorkMod (what’s a custom recovery? What Is a Custom Android Recovery? Getting Started With TWRP What is a custom recovery on Android? What can you do with it? We explain Android recoveries and show you how to get TWRP. Read More ), it’s  just a modified version of a standard recovery environment. I recommend that everyone who installs a custom ROM also install the recovery (why you need a custom recovery 6 Key Tips To Avoid Bricking Your Rooted Android Device When you own a rooted Android phone running a custom ROM, you need to take some precautions or risk "bricking" (destroying) your device. Read More ). But the bootloader works fine if you’re just performing a factory reset. Unfortunately, you need the custom recovery in order to perform a full backup over your operating system.


Change charger and cable: Everyone should use a power source and USB cable that they know works and which supplies the necessary amperage. If an improper or damaged charging apparatus is used, the user’s device may not charge and will only appear to be broken. A deep-discharged battery may require overnight charging.


What to do After Android Fails to Boot?

When an Android smartphone or tablet stops booting, there are two questions that you need to ask yourself: Is the fault hardware or software related (for simplicity I lump software and firmware into the same category)?

A successful diagnosis requires observation. Does the Android device do anything out of the ordinary? And what did the user do to the device prior to boot failure? The answer to both questions can solve, or explain, boot failure.


Four common categories of unbootable device exist:

  • Unbootable Scenario #1: No charging light, not warm after charging, not detected after plugging into a desktop or laptop computer, no Android boot screen;
  • Unbootable Scenario #2: Charging light turns on, detected after plugging into desktop or laptop, no Android boot screen.
  • Unbootable Scenario #3: Boot screen continually displays, system freezes or constantly reboots;
  • Unbootable Scenario #4: System does not boot and displays an error message on a black screen;

Before repairing the issue, we need to explain the various tools and tricks at the Android user’s disposal:

What are the Android Tools for Recovery?

There’s a metaphorical arsenal of tools for fixing Android boot problems. Here’s the most common:

  • Bootloader (or recovery) factory reset;
  • Bootloader (or recovery) cache wipe;
  • Software recovery toolkit;
  • Android Safe Mode;
  • Battery pull;
  • Soft and hard reboots;

How to Use an Android Bootloader?

A bootloader enables users to load different bootable portions (or partitions) of their operating system. It allows users to select between booting a recovery partition or their operating system. When the operating system cannot boot, the bootloader can restore the original factory-fresh operating system.


Manufacturers also include options within either the recovery or bootloader to wipe the device’s cache. Wiping a corrupted cache can similarly fix boot issues. However, each device manufacturer differs in the kind of tools and features available within the pre-boot (or bootloader) environment. They also differ in how users enter this environment.

Here’s an example of what my bootloader looks like on a Moto X 2014:

android bootloader environment

As you can see, there are multiple options available. The most salient (on an unmodified device): the Factory, or Factory Reset option.


Factory Reset an Unbootable Android Device

The most common way is to turn the device off. Next, press and hold power and volume down. Then while holding power and volume down, wait until the device vibrates softly and enters into the Android bootloader (or recovery). Note: Some manufacturers use the volume up button, instead of volume down.

Again, these environments differ from manufacturer to manufacturer, but most include all the same basic features.

Select Factory Reset using your volume keys to scroll and power button to select an option. The device then initiates a restoration of its original factory-new state. It should reboot and begin a long re-initialization process. However, if you’ve installed a custom ROM, exercise the utmost caution in whether or not you use the Recovery or bootloader to initiate the factory reset process. Generally speaking, if you’ve modified your system, perform the factory reset from the custom recovery (what’s a custom recovery? What Is a Custom Android Recovery? Getting Started With TWRP What is a custom recovery on Android? What can you do with it? We explain Android recoveries and show you how to get TWRP. Read More ).

Also keep in mind that the volume keys don’t always function as directional keys. On Motorola phones, the volume up button selects an option and the volume down button scrolls through the options.


Bootloader Access Variations

To my knowledge there are four different kinds of key combinations that allow users to load their bootloader. Users must perform these key combinations from a powered off state:

  • Power + volume up
  • Power + volume down
  • Power + volume up + volume down
  • Samsung’s method (see below)

If you find it difficult locating the bootloader, keep in mind that not all manufacturers refer to their bootloader by name. Some (particularly Samsung) refer to it by a trade name (although Android includes its own version of Download Mode). You should concern yourself with finding the factory reset option. If in doubt, use a search engine.

Here’s a great video which describes some of the byzantine variations in how users factory reset their device. Some devices allow a factory reset by simply tapping buttons while booting. Others require booting into the bootloader:

Samsung Download Mode

Unfortunately, many of the major device manufacturers use differing methods of reaching the bootloader (or other modes). Samsung refers to their pre-boot recovery environment as Download mode. Because Samsung devices can include a physical home button, they sometimes use this as a means of accessing the pre-boot environment. Here’s a quick tutorial on how to boot into Samsung’s Download mode:

Because of the tremendous variation in Samsung devices, you need to perform an Internet search on how to access your particular smartphone model’s Download Mode.

How to Use an Android Bootloader or Recovery to Wipe a Cache?

Another repair option resides inside of the Android pre-boot environment. Most manufacturers include an option to wipe the cache partition from within the recovery, but I’ve heard of the bootloader including this feature as well. There are two kinds of caches: The Dalvik cache or the system cache. Android 5.0 and above only includes the system cache because it uses ART compilation (ART increases Android speed Does Switching To ART Speed Up Your Android KitKat Device? Is ART best left alone until Google decides to roll it out as a working replacement for Dalvik? Read More ), which makes wiping the cache simpler.

To wipe the cache, boot into the Android bootloader and select the recovery option.

Some manufacturers at this point require additional key presses in order to wipe the cache partition. For example, my Moto X requires pressing and holding the power button and volume down.

Then select wipe cache partition from the options. When it finishes wiping the cache, reboot.

android recovery menu moto x

How to Use a Software Recovery Toolkit and Other Options?

Recovery toolkits range from manufacturer to manufacturer. Nexus devices receive access to several different variations, like WugFresh (no longer available). Then there’s Samsung’s Kies toolkit option. Other software tools include Minimal Fastboot and Koush’s Universal ADB Drivers.

Minimal ADB and Fastboot Toolkit

The easiest method to access ADB: the Minimal ADB and Fastboot installable tool. Minimal ADB and Fastboot allows users to employ ADB commands and Fastboot, without downloading the Android Software Development Kit (SDK), which contains a lot of tools you don’t need. It’s easier and less prone to error than using the whole SDK, which is a fairly large download. I should note that Fastboot requires a special bootloader in order to work, which some unmodified Android devices do not receive access to.

The biggest advantage of Minimal ADB: You get an ADB driver package, along with the tools required for connecting your device to a Windows computer.

Simply download Minimal Fastboot and install it.

Here’s a video on how to use ADB (if you installed Minimal ADB and Fastboot, you don’t need the Android SDK):

Koush’s Universal ADB Drivers

If you can’t connect a device to a Windows computer using the ADB protocol, then I recommend installing Koush’s Universal ADB Drivers [No Longer Available]. Here’s a short guide on connecting Android to Windows via ADB Android Won't Connect to Windows Over ADB? Fix It in 3 Easy Steps Is ADB not detecting your device? When Android is unable to connect to ADB, here's how to fix it and get connected again. Read More . The drivers enable Windows to recognize Android devices.

Android devices use two different protocols – and drivers – for connecting to a desktop computer. ADB allows users to access the file structure of the Android operating system, which in turns allows users to restore the original firmware, and a lot more. For unbootable devices, this allows users to install the correct drivers, which then opens the door to interacting with your phone’s operating system.

Koush’s Universal ADB Drivers provides an alternative to downloading and installing and configuring the entire Android SDK for your device. It covers the vast majority of Android smartphones and tablets, but not all. You may want to try installing your official drivers first – and if that fails — install Koush’s drivers. Remember that this step only opens the door to dealing with boot problems. An ADB connection requires that you first enable ADB access in an already functional system. If your phone fails to boot and you haven’t enabled ADB, you can’t use this step.

How to Use Android Safe Mode?

Android’s Safe Mode functions similarly to Windows Safe Mode How to Boot in Safe Mode on Windows 10 Facing Windows booting problems? Safe Mode is a built-in Windows 10 troubleshooting feature you should try first. Read More , meaning it loads the operating system without any third party software. This prevents malware or buggy software from interrupting the boot process. There are variations on how to enter Safe Mode — the most important for an unbootable device is from a powered off state. Simply hold power, volume up, and volume down until the Android boot screen displays. After the boot symbol displays, release the power button, but continue holding the volume buttons until the operating system fully loads. You should notice grayed-out icons and the words “Safe Mode” in the lower left side of the screen.

Users can then uninstall malware or dysfunctional applications as they would normally.

In Android Gingerbread (2.3) and below, from a powered-off state,  hold the power button down until Safe Mode launches.

How to Pull a Battery on Android?

A battery pull requires temporarily disconnecting a smart-device’s battery. This method offers a near bullet-proof means of resetting an Android device – particularly if it’s locked into the so-called sleep of death, where the device refuses to power on. Unfortunately, most modern flagship phones no longer include a removable rear cover. Some even solder the battery into the device, to prevent user-replacement of the battery.

Performing a battery pull requires simply removing the rear cover and disconnecting the battery. Some devices make removing the rear cover (such as replacing the Nexus 4 battery How To Replace The Nexus 4 Battery (It Can Be Done) [Android] Got a dead or worn-out Nexus 4 battery? Replacing the defective battery is dead-simple – simply crack your phone open, pry the old battery out and pop in a fresh one. However, unless you want... Read More ) not very difficult. Even the Nexus 5 and 5X rear covers aren’t hard to remove.

After dislodging the rear case, simply detaching the battery connector from the battery will disrupt power to the device, and effectively perform a hard reset. Don’t remove the battery from the device. Then reconnect it and boot back up.

How to Perform a Hard or Soft Reset on Android?

The two quickest options available to Android users for resetting their devices: Hard and soft resets.

Hard Reset

A hard reset restores the operating system back to its original, factory-fresh state. Performing a hard reset requires entering the Android bootloader (or recovery).

First, power the device off. Then hold down the power and volume down buttons until the bootloader displays. Then choose any option that sounds like a Factory Reset. For example, my Motorola bootloader only displays “Factory”, which is the same as Factory Reset. Choosing this option restores the phone to its factory new condition.

If this option fails, it could mean that the recovery partition is corrupted. Oftentimes installing a custom ROM can erase the recovery partition, which contains a complete copy of the original operating system. Losing this partition can greatly impede repair efforts.

Here’s a video on how to perform a hard reset:

Soft Reset

Performing a soft reset is dead simple on the vast majority of Android devices: Just hold the power button down for 10 seconds. Within 10 seconds, the device should reboot.

This method doesn’t always work, but its reliability and simplicity make it a first option on phones with boot issues.

Here’s a video on how to perform a soft reset:

Having trouble with the buttons you need to reset your device? Here are fixes you can try when your Android phone buttons don’t work 5 Fixes to Try When Your Android Phone Buttons Don't Work Have a button on your Android phone that stopped working? Try these fixes to repair or work around a faulty smartphone button. Read More .

Unbootable Android Scenarios

There are several issues to consider if your Android phone won’t boot at all.

Unbootable Scenario #1: No Lights, No Signs of Life

Your Android device displays the following symptoms:

  • The charging indicator does not turn on when plugged into a power source;
  • Performing a hard reboot doesn’t reboot the device;
  • Your device doesn’t show up as connected when plugged into a PC;
  • When plugged into a power source, the phone and power adapter don’t feel warm;
  • No Android boot screen;

It could suffer from a damaged power adapter or microUSB cable. Change these and make sure the power adapter supplies the necessary amperage (normally at least 1.5 mA). Then plug the device into a computer and (in Windows) check in Windows Device Manager to see if the computer detects whether or not the Android device connects.

Under Android Devices you might see the device connected. That means it’s recognized by the computer. That means it’s not dead.

android media device

First, leave it charging for several hours. Next, attempt a Soft Reset. If that fails, then perform a hard reset. If that fails, attempt a battery pull. If a battery pull fails (or if it has a non-removable battery), plug it into a computer to see if it is recognized. If that fails, then the device might suffer from a bad battery or damaged mainboard. You will need to return the device to the manufacturer for repair.

If plugging it into a computer succeeds and you have access to either Fastboot or ADB, then you might be able to install the original operating system, provided the manufacturer allows users to download factory images of their operating system.

Unbootable Scenario #2: Some Signs of Life

Your Android device displays the following symptoms:

  • Charging light turns on when connected to a power source;
  • Detected after plugging into desktop or laptop;
  • No Android boot screen;

In this scenario, the device shows some signs of life, but doesn’t fully function. It could suffer from a damaged power adapter or microUSB cable. Change these and make sure the power adapter supplies the necessary amperage (normally at least 1.5 amp).

First, leave it charging for several hours to make sure it’s fully charged. Next, perform a soft reset. If that fails, attempt to boot into the bootloader. If that succeeds, perform a factory reset. If that fails, the device may require a licensed technician.

Unbootable Scenario #3: Bootloop

If you installed a custom ROM, then a bootloop can be far more severe than on a stock, unmodified device. Bootloops often occur because of a damaged operating system or a malicious app.

  • Boot screen continually displays, system does not boot;
  • Sometimes occurs after a failed OTA update;

First, try a soft reset. If that fails, try booting the device in Safe Mode. If that fails (or if you don’t have access to Safe Mode), try booting the device up through its bootloader (or recovery) and wiping the cache (if you use Android 4.4 and below, wipe the Dalvik cache as well) and reboot. If that fails, you must employ more drastic methods: Reboot into the bootloader and perform a factory reset. If that fails, the device might require service from a licensed technician.

If you understand how to use Fastboot, you might want to check this video out:

Unbootable Scenario #4: System boots, but displays error message(s)

These kinds of error messages appear for both hardware and software faults. A variety of error messages will display if the core operating system files suffer from damage. Also, a defective eMMC drive (its hard drive) can corrupt data.

  • If you modified your operating system in any way, such as through acquiring root access or installing a custom ROM.
  • If an OTA software update failed;
  • If the device displays a dead Android;

First, attempt a soft reset. If that fails, boot into the bootloader and attempt a factory reset (AKA hard reset). If that fails, attempt to wipe the cache. If that fails, your options become limited. You can attempt to reflash a system image using a toolkit or manually using the ADB. Otherwise, the device might require a licensed technician in order to properly restore its operating system.

Android Boot Problems?

The simplest method of dealing with an unbootable Android device is working with the bootloader environment. Unlike most installations of the Windows operating system, Android offers users a clear and easy method of resetting their device back to factory-fresh condition. When the recovery fails (or simply doesn’t work), users still can repair their device using other means, such as ADB.

If, in some unforeseen scenario, you end up bricking your device, try these recovery methods to unbrick your Android device.

Want to learn more about Android? Check out these informative Android sites 6 Informative Android Sites You Should Bookmark Today Knowing everything about Android can be tough. These informative Android websites are worth a bookmark for any Android lover. Read More .

Related topics: Android Rooting, Android Tablet, Boot Screen, Troubleshooting.

Affiliate Disclosure: By buying the products we recommend, you help keep the site alive. Read more.

Whatsapp Pinterest

Leave a Reply

Your email address will not be published. Required fields are marked *

  1. Mike Johnson
    July 28, 2020 at 3:00 pm

    Thank you!

  2. Luc
    June 8, 2019 at 12:13 am

    it says that i should send it to a lincensed techinician but my phone has no brand and there are no technicians to fix it...

    • kannon
      June 11, 2019 at 8:44 pm

      Repairing a phone that doesn't have a brand is probably more expensive than buying a new or used one.

  3. Nilesh
    October 5, 2018 at 1:04 pm

    I'm using samsung galaxy j7 a model of 2106. I rooted it and it was working good, but then i thought to switch it from custom rom to the stock rom. So i downloaded a stock rom file and tried to flash it with odin3 v3.10. The stock rom file contained 4 diffrent files, from which the bootloader file was failing the process. So i skiped the BL file and flashed it with remaining 3 files and I succeeded. But as soon as phone started, it was not detecting sim cards. It is a dual sim phone and both the slots are unable to detect sim cards. I think the problem was caused due to the file i skiped.
    Now when again rooted my phone problem still remains the same.. No matter what i do, i can't resolve it. I even tried downloading different stock rom files, but every file's bootloader file was causing problem, even the file i downloaded from the site was also failed.. Please help, what should i do?

    • Kannon Yamada
      October 7, 2018 at 6:19 pm

      If you didn't manage to flash a bootloader, that might affect other features of your phone. As far as I know, your stock bootloader should still let you run ODIN as a means of interacting with your phone's firmware. That means you should still be able to flash another firmware onto your phone. The best place to ask this question is on the XDA forums as they have more experience with ODIN and your specific model of phone.

      Do you know your baseband version? A big problem with installing custom ROMs on Samsung devices is that there can sometimes be a lot of different baseband versions (these impact your cellular radio and SIM cards)

  4. Camille
    September 21, 2018 at 10:05 am

    Hi Sir,
    My phone is ASUS Zenfone Live. Whenever I tried to charge my Phone It doesn't show any lights just the CSC Fastboot Mode. And when I plug it in my computer it it is unrecognizable.
    What should i do with this phone?

    • Kannon Yamada
      September 25, 2018 at 9:58 am

      I'm not familiar with this model. If the charging light isn't coming on but the phone is still charging, I have no idea what the issue is. Can you enter recovery mode at all? There is a website called that has the specific instructions for entering recovery mode or performing a factory reset without needing to boot the phone into the operating system.

      Have you tried entering recovery mode? It's a pretty simple key combination. Just soft reset the phone by holding down the power button and then while the phone restarts hold volume up and the power button.

  5. Rajat
    October 4, 2017 at 8:03 am

    MY android phone is stuck on its boot screen. Earlier it was processing two to three seconds of boot animation and would return back to the same and this would go in loop. But now it's only stuck on boot screen, showing Micromax Powered by Android and that's it.
    Tell me what to do. I have got data in my phone :(

  6. chip
    June 2, 2017 at 7:30 am

    kobo arc 7, android jellybean, never rooted or installed custom rom, won't turn on properly, only displays first boot screen and never changes, not detected by computer, tried to enter recovery mode but it just restarted normally which didn't work

  7. killme
    February 6, 2017 at 8:24 pm

    Ok, so, I have an A23 GA10H tablet, whenever I try to do something, it just turns on, displays the logo and that's it. ADB can't detect it, not in adb devices nor fastboot devices (all drivers are installed), when i plug it in, it instantly turns on displaying the android logo, same as with turning it on. Cannot access recovery mode, computer detects it but displays and an unknown device. Last thing i did was to try and do a fastboot recovery with a recovery.img, but then i noticed i was not where the recovery.img was, so now the tabled is practically dead.

    • Kannon Yamada
      February 9, 2017 at 1:56 pm

      Is the device modified in any way? For example, has it been rooted or have you attempted to install a custom ROM or custom recovery?

      ADB will only detect a device that has had ADB enabled (which you have to manually enable from within the device). However, following a factory reset, ADB is also reset. Basically, what that means: if you've modified your device in some way and then factory reset it, you'll lose ADB. That normally means that fastboot still works, though. The fact that you're not getting fastboot suggests something else is going on.

      I strongly recommend that you make absolutely certain that you have the correct ADB drivers installed on your device. See the below article for details on how to do this:


      The reason I suggest the above method is that ADB can be really picky about what drivers work and what doesn't. Oftentimes, you'll have to experiment with different ADB drivers in order to get it working properly. But if you've tried all the drivers that are available in the standard universal ADB driver package (manually trying them), then you might have a problem. However, I don't understand how you were able to try restoring the recovery via fastboot because you mentioned that fastboot was not working. Or am I understanding?

      • Killme
        February 15, 2017 at 10:12 am

        I mean the tablet was working, but after i tried resetting bootloader, it bricked the device and it no longer works. It does exactly nothing while trying to boot. And maybe i did not speak clearly? But what i meant was it worked before? now nothing works

        • Kannon
          February 15, 2017 at 11:32 am

          I'm unaware of any method of resetting the bootloader that doesn't involve using fastboot/ADB to manually flash a bootloader image. If you've flashed the wrong bootloader or a corrupted bootloader image, it may not be recoverable.

          Can you verify where you downloaded the bootloader from?

  8. Akash
    January 13, 2017 at 11:34 am

    hello sir,my phone is asus zenfone max.i tried to install custom rom.but after i done reboot then phone didnt switched on (Unbootable Scenario #1: No Lights, No Signs of Life) problem.but when i plug to laptop it detected but i didnt get solution part pls help me...
    thank you

    • Kannon Yamada
      January 17, 2017 at 3:25 pm

      Can you boot into the recovery environment?

      • Akash
        January 18, 2017 at 10:24 am

        mobile is not switching on sir.not charging, no led light also.i cant boot mobile in csc mode or recovery mode

      • Akash
        January 18, 2017 at 10:27 am

        Sir, mobile is not switching on .i cant boot it into recovery mode or csc mode. Unbootable Scenario #1 problem.but when i plug to laptop it detects thats all. thank you

        • Kannon Yamada
          January 21, 2017 at 10:41 am

          Have you already tried to pull the battery? If the battery is not removable, you may need to contact a technician. However, in your case it appears that the problem might be that you flashed an incorrect custom ROM. I would double check to make sure that you did indeed flash the correct ROM for your phone. If the wrong ROM has been flashed, the phone is normally not recoverable.

  9. Ankit
    December 29, 2016 at 12:18 pm

    I swappedl default storage and boot image lost bootloader is on . huawei y6

    • Kannon Y
      January 3, 2017 at 5:22 pm

      Can you elaborate a little more on what you've done to the device? It sounds as if you may have installed a custom ROM. That can cause all kinds of issues.

  10. Parish
    November 28, 2016 at 2:04 pm

    I once bricked my lenovo a6000 and when ever i try to reset it or flash other custom ROM it get stuck in the bootloop.

    • Kannon Y
      November 29, 2016 at 4:43 pm

      There are a lot of different kinds of causes for bootloops. Most of the time it's caused by not following the instructions for flashing a ROM to the letter. Other times, it can be caused by not flashing from the right version of Android.

  11. ANNE
    September 24, 2016 at 4:01 am

    How is it? My huawei phone recovery already. As i turn on its On then as i open clash of clan it says : PTO or PTIO something like this says unexpected nit responding. Then my phone back to stuck off logo. I do press up,down vol and power on but still the same,logo is always shown. How to fix it
    Help pls.

    • Kannon Yamada
      September 26, 2016 at 1:44 am


      It would help if you mentioned where you downloaded Clash of Clans from. Or anything out of the usual. Otherwise this sounds like a job for Safe Mode.

      It's true that some apps can cause instability after installing them, but they only crash the phone if it has permission to start at boot. In that case, you would just use your phone Safe Mode to boot it. If the phone doesn't boot then there is some other cause.

  12. ANNE
    September 24, 2016 at 4:01 am

    How is it? My huawei phone recovery already. As i turn on its On then as i open clash of clan it says : PTO or PTIO something like this says unexpected nit responding. Then my phone back to stuck off logo. I do press up,down vol and power on but still the same,logo is always shown. How to fix it
    Help pls.

  13. ANNE
    September 24, 2016 at 4:01 am

    How is it? My huawei phone recovery already. As i turn on its On then as i open clash of clan it says : PTO or PTIO something like this says unexpected nit responding. Then my phone back to stuck off logo. I do press up,down vol and power on but still the same,logo is always shown. How to fix it
    Help pls.

  14. ANNE
    September 24, 2016 at 4:01 am

    How is it? My huawei phone recovery already. As i turn on its On then as i open clash of clan it says : PTO or PTIO something like this says unexpected nit responding. Then my phone back to stuck off logo. I do press up,down vol and power on but still the same,logo is always shown. How to fix it
    Help pls.

  15. ERIC TAN
    September 21, 2016 at 10:59 am

    Hi I have a MOTO G 2nd Gen. It won't boot or show any LED light when a wall charger is plugged in. I have to disconnect the battery, only then will the LED light come on. Next is to enter bootloader and choosing NORMAL BOOT. I then reconnect the battery and trigger the NORMAL BOOT option. It then boots up. Phone runs fine, having done a full factory reset and battery shows 90+%. HOWEVER, the moment the screen goes off. I can't power it up anymore and have to repeat the above process to boot. Any idea what could be wrong? I've already done all the scenarios in your posts. I've also tried holding down the POWER button for up to 5 minutes too, but unsuccessful.

    • Kannon Yamada
      September 26, 2016 at 1:52 am

      Hi Eric, that's a really bizarre issue. Has the phone been modified in any way, such as with root/custom ROM?

      So, if I'm understanding correctly, the power status LED won't turn on if the device has a battery inside of it. If the battery is removed, then the device WILL power on.

      What makes this really strange is that Android handsets aren't designed as passthrough devices, meaning a charge can't passthrough a cable and power the device on unless the battery is inserted. I'm sure there's devices out there that can do this, but the majority of devices that I've seen can't power on unless there's a battery inserted.

      I can't explain your problem and unfortunately can't diagnose it either.

    • ERIC TAN
      September 26, 2016 at 9:27 am

      Thanks for your reply. I was watching a youtube guy doing it. His was the moto G1. So I followed his method by disconnecting the battery. I do not have a custom rom, it's pure stock rom. Yes, your statement is what as I had described. Guess I will bring it to a shop to repair it, that's provided it's not too expensive.

      Thanks again. Appreciate your reply.

  16. maanjunadh
    August 23, 2016 at 5:44 pm

    i am using spice android one . 10 days back i have flashed a rom it worked properly one day my google play store was show unfortunately google play store has stopped , so i just turned off the phone after that it stuck on boot logo , i have waited for 1 day still it is showing same problem, then i decided to wipe data with recovery mode , it is showing INVALID ARGUMENT ,fastboot oem unlock is also not working,it show to conform after conformation it automatically locks , i have wiped every thing with fastboot including bootloader ,system image etc ,Now my phone is not showing any thing , even it is not turning on ,

    Is there any hope to recover this phone

    • Kannon Yamada
      August 23, 2016 at 6:05 pm

      Eliminating the bootloader makes the phone completely unusable if you do not have access to ADB or fastboot. The bootloader determines what boots. If it's gone, then there's no way to boot the device without special understanding of special development tools.

      Do you have a custom recovery installed?

  17. Joey
    August 20, 2016 at 4:03 pm

    I have a galaxy note 4 and yesterday I did a factory reset and now the phone is stuck in recovery mode but it flashes so I can't see anything! How do I fix that?

    • Kannon Yamada
      August 22, 2016 at 5:18 pm

      That sounds like a damaged recovery or bootloader. Can you describe in more detail what options you have access to? If the recovery itself is crashing and rebooting, it's either a serious hardware fault or a potentially damaged recovery environment/bootloader.

      • Joey
        August 22, 2016 at 11:35 pm

        Well it's no other option I've taken out the battery and nothing! When the phone starts it boots up in recovery mode and it just starts flashing really fast and I can't do anything!

        • Kannon Yamada
          August 23, 2016 at 1:40 am

          It's a shame that this has happened right after a factory reset. Sometimes you can use ADB to fix problems on a smartphone even if it can't be fully booted. But in this case, I just don't see how it can be repaired. Have you tried Samsung Kies yet?

  18. DeLuX
    August 19, 2016 at 6:55 am

    Hi y Android devices have a problem and i think its not listed from above it have sign of life when i leave it charging no battery charging indicator no display, not detectable on the pc/laptop, but somehow its still warm.

    it happens after my couz flash a custom ROm on it.

    • Kannon Yamada
      August 22, 2016 at 5:23 pm

      That's always a tough situation. Flashing a custom ROM has a very good chance of causing serious problems. Have you tried holding the power button for 30 seconds yet? It might cause the device to reboot, although this situation seems almost unresolvable.

      If the device isn't recognizable over a USB connection, then you lose the majority of the last-resort recovery options, such as ADB and fastboot. In scenarios like this the most common course of action is to pull the battery or let it discharge over a period of days.

  19. Hannah
    August 17, 2016 at 6:23 pm

    Hey there,

    Recently I tried to update a system app on my Blu Energy Studio 2. The app was Wireless Installer or Update. It took me into Recovery Mode and I got stuck. Came to this page, tried to enter Safe mode.... Then I got stuck on the Boot screen!! Then I tried to perform a soft reset and now I'm back in recovery mode. I would really, really like it if I didn't have to perform a factory reset.

    If it helps I recently rooted my phone. Everything was working fine until I tried to update. Please, are there any suggestions?

    • Kannon Yamada
      August 22, 2016 at 5:15 pm

      Can you clarify some points for me? Is it booting direct to Recovery Mode or is it booting into the bootloader? The two look very similar and on some devices they are essentially the same. Have you tried to enter Safe Mode yet?

    • Kannon Yamada
      August 22, 2016 at 5:16 pm

      By the way, the root process can be the culprit here, since it modifies your system directory. The system directory is extremely sensitive to tamper and can easily render your phone unbootable. I do not recommend the root process on anything other than a Nexus device because of these complications.

  20. Skilzwell
    August 13, 2016 at 9:39 pm

    Heybeen asking Every1 & am yet 2 get an answer. 2 days ago my unlocked s5 active was getting marshmallow (which I've been dying 2 get!!!) I was all hyped up the att symbol showed the % beneath it loaded up to 100 thenit said kernel in red top left portion of my screen & then it said software unrecognized by att, then locked me out. Saying turn off & bring 2 att store. With this symbol center screen? now the custom and unlocked lock show upon startup. I got lollipop no problem. And I NEVER rooted or anything like that. Please tell me what 2 do so I can get my OTA update. Thanks!!

    • Kannon Yamada
      August 13, 2016 at 9:43 pm

      Was the phone originally carrier locked and you've since moved it to another carrier? Carriers modify factory images in a way that causes a lot of problems. The OTA vanilla image that's pushed out by OEM might not be the same image that your carrier pushes out.

    • Kannon Yamada
      August 13, 2016 at 10:05 pm

      I should clarify, by saying that the phone could be from anywhere, I meant that the phone could be from anywhere in the world. It might not be compatible with the latest image from AT&T. Samsung manufacturers a lot of different kinds of Galaxy phones for specific regions. For example, the Samsung Galaxy S4 Mini has like over a dozen variations and not all of them received the latest firmware update.

  21. Roger Ching Zhen Nyet
    August 10, 2016 at 6:53 am

    Help. I can't switch on my phone. It says "recovery booting... Secure fail: Kernel" What can I do

    • honey
      August 13, 2016 at 7:51 am

      flash appropriate rom for your phone

    • Kannon Yamada
      August 13, 2016 at 6:01 pm

      What model of phone is it and is it modified?

    • Skilzwell
      August 13, 2016 at 9:54 pm

      No. Bought it "new" on ebay. It said it was an unlocked att with kitkat4.4.4. I've since received every OTA from Att whom I've been using as my carrier from day 1. I got security patches, lollipop etc. But this time during the update it stopped said kernel in red & locked me out.a hard reset got it working again but I want my update! ?I never seen this "custom " business until after the failed update. 1 more strange thing.. about 10 mins after getting working again I got the "ur update is now complete message" ?? Yet still have 5.1.1 I just really want marshmallow & don't understand how this custom whatever never showed itself until now?

      • Kannon Yamada
        August 13, 2016 at 10:01 pm

        Ah, that explains a lot. If it's an eBay phone it could be from anywhere, meaning it might not have the correct baseband that's getting pushed out. Another possibility is that AT&T is pushing out an image that your phone is not compatible with. The second possibility sounds screwy, but it's a relatively well-known problem. For some reason, some phones just won't work with the firmware image that carriers push out. The over-the-air updates will work on some phones, but not others. I would speculate that there are minor differences between each mobile system-on-a-chip.

        Can you go to Settings --> About Phone --> locate the baseband number? Please respond with the baseband number.

  22. Rha Liason
    August 9, 2016 at 6:27 pm

    i cant get into recovery-mode just hangs. factory mode works all checks completed. Wiko Rainbow phone

    • Rha Liason
      August 9, 2016 at 6:30 pm

      normal boot, just "begin screen", and than rainbow logo and than nothing.

    • Kannon Yamada
      August 9, 2016 at 8:01 pm

      Does it offer any alternative to recovery mode? There are other modes which allow users to flash factory images from ADB/fastboot. Have you rooted or installed a custom ROM on the phone?

      • Rha Liason
        August 14, 2016 at 8:29 am

        yes only factory mode works, and completes all tests i tried.

        tried to hook via usb to pc, but fails to recognise as it stuck in bootmode, and in factory-mode

        no phone just didnt boot on next day , no updates, no custum roms nor rooted

    • Skilzwell
      August 13, 2016 at 10:23 pm

      But I got lollipop updates? The baseband is G870AUCS2CPB6

      • Kannon Yamada
        August 13, 2016 at 11:04 pm

        You have the correct baseband version in preparation for updating to Marshmallow:!/wireless/KB425050

        I don't know what's going on. My best guess is that the previous owner "sideloaded" a factory image. Given AT&T's recent security policies the phone might not update on top of a sideloaded image. A sideloaded image is when someone downloads the factory image of an operating system and manually installs it using their computer (over something called ADB).

        I'm just guessing at this point. My advice is to try Samsung Kies to try and install the Marshmallow update. That might not work though, in which case, you can just wait until a third party captures the OTA and download and install through them:

  23. Annelies
    July 30, 2016 at 8:07 pm


    my Motorola is under scenario #1 above, no signs of life .
    When plugged into a computer (I have tried different USB cables), the computer device manager says it's an unknown device that malfunctioned. The battery is unfortunately not user removable.
    Do you have any ideas what could be the next step?

    • Kannon Yamada
      August 9, 2016 at 8:05 pm

      You could wait until the battery naturally discharges on its own. It's also possible that the battery has been deep discharged, in which case you would only need to leave it plugged into a reliable charger overnight.

      It's a good sign that your computer detects the phone. That generally means there's some signs of life. Have you tried holding the power button down for any extended period of time? Some suggest 30 seconds of holding the power button down can cause it to reboot. Others suggest that 15 seconds is more than enough. In truth, it varies by device, but 30 seconds, just to be safe, is oftentimes a good first step.

    • Skilzwell
      August 14, 2016 at 12:39 am

      Is there anyway 2 restore my phone 2 "at&t standards" so that my future OTA updates will continue? Or any way 2 identify what the person did that made this "custom" appear?and undo it? Bcuz it seems like with all of these security patches I'm only going 2 run into more problems.. and I CANNOT AFFORD A NEW PHONE I saved up 4 a year just 2 get this! And have been looking 4ward 2 marshmallow since development. I always do android check ins and manual update checks. Which I did 2day and it said I was up 2 date smh..?.

      • Kannon Yamada
        August 14, 2016 at 12:48 am

        I'm speculating at best. You could try asking the person on eBay whom you purchased the phone from. It might turn out that the phone was not modified in any way and that this problem is caused by something else. But my best guess is that the current image has been sideloaded.

        Have you tried using Samsung Kies? It's their official software and it can upgrade your phone manually. I wasn't sure if you were confirming in your last response.

    • Skilzwell
      August 14, 2016 at 1:07 am

      I'm really not too familiar with this sort of thing. If it was sideloaded, it would've been the original KITKAT Version. I got an OTA for lollipop after that. So wouldn't it recognize that as its own update? And as far as samsung kies I'm not familiar.. is there a link u could provide. Do I need 2 use my pc? Lastly will it lock me out again if kies doesn't work? Or any other way doesn't work? I appreciate your help and time!

      • Kannon Yamada
        August 14, 2016 at 1:21 am

        That's a good point. It's possible that AT&T may have put additional restrictions on the Marshmallow update.

        Here's the link for Samsung Kies:

        It requires a computer of some kind. Good luck!

      • Kannon Yamada
        August 14, 2016 at 1:24 am

        I don't know whether or not it will lock you out. It sounds like you were able to get back in, so I'm assuming that it was just an error message. Have you considered taking it into the store? The problem may have been their fault to begin with. Failed OTAs can cause problems like this.

        • Skilzwell
          August 14, 2016 at 4:12 pm

          Ok. Thank you 4 the kies link. I backed up my phone. But it said my firmware is up 2 date. Which strangely enough, the security update, the Knox numbers and the other stuff all matched?? But it still is running lollipop 5.1.1? Is there anyway 4 me 2 attach a pic 2 show u what I mean? It's like I got the update sans the marshmallow OS.. THIS IS REALLY STRANGE.

  24. Nouman Awais
    July 28, 2016 at 3:59 am

    Awesome effort dude I find it useful enough to get my phone back :)
    Thank You

    • Kannon Yamada
      July 28, 2016 at 5:49 pm

      Thanks for letting me know the guide helped Nouman! Can I ask what the original problem was and how you managed to repair it?

  25. mark cockcroft
    July 26, 2016 at 6:10 am

    Thanks for your response,
    Thing is there isnt one thing that triggers the rebooting as the phone at times reboots
    when im not even using it. I was posting pics to instagram other day and first two went
    through fine but when i wanted to send the third one it rebooted,other times im busy on whatsapp
    and it will reboot. Ive done a factory reset few times already but it hasnt solved the problem either.

    Mark Cockcroft

    • Kannon Yamada
      July 28, 2016 at 5:52 pm

      Hey Mark,

      Have you tried leaving the phone in Safe Mode for a few days yet? Generally speaking, there are two kinds of causes for malfunctioning hardware: Physical or software. If there is a physical problem with the hardware, no amount of tweaking will get it working. If there's a software problem, then oftentimes a factory reset or removal of certain software can get it working properly again. Granted, there are issues like a corrupted OS that aren't totally user-resolvable.

  26. Mark Cockcroft
    July 25, 2016 at 12:40 pm

    Hi there,

    I have a Huawei Mate 8 and it has a habit of rebooting every so often-have sent the phone away and nobody can tell me what's wrong- im scared that this will have an adverse affect on the phone if it keeps doing this,please help


    • Kannon Yamada
      July 26, 2016 at 4:09 am

      There may not be a good solution. I would try running the phone in Safe Mode for a few days to see if it ever reboots. If it doesn't, then you might have an application that's causing the issue. If it does, then the phone could have a hardware problem.

      Hardware problems generally aren't resolved after performing a factory reset. Oftentimes, unfortunately, the simplest fix revolves around replacing the mainboard. Unfortunately, the cost of labor including the replacement part is oftentimes more than the phone itself.

      Can you provide more details on what happened just prior to the phone misbehaving and what steps you've take to fix the issue?

      • mark cockcroft
        July 26, 2016 at 9:37 am

        Thanks for your response,
        Thing is there isnt one thing that triggers the rebooting as the phone at times reboots
        when im not even using it. I was posting pics to instagram other day and first two went
        through fine but when i wanted to send the third one it rebooted,other times im busy on whatsapp
        and it will reboot. Ive done a factory reset few times already but it hasnt solved the problem either.

        Mark Cockcroft

    • Mark Cockcroft
      July 28, 2016 at 6:00 pm

      I've put it on safe mode and within the first hour it had rebooted-out of desperation I have now sent the phone back to my service provider to be sent away and checked again

      • Kannon Yamada
        July 28, 2016 at 6:09 pm

        I'm sorry to hear that. That's a sign something is wrong with the hardware.

        Unfortunately with these kinds of issues carriers can be really irresponsible. A technician working for the carrier or manufacturer might only look at the device for a few minutes before deciding that it works perfectly -- they then send the device back, claiming there was nothing wrong with it.

        The carrier might send you another refurbished unit, though, but that also has a chance of suffering from a similar issue.

  27. Steffen
    July 24, 2016 at 5:03 pm

    Hello sir.

    I have a small problem after flashing a custom ROM on my Galaxy Xcover 2. It Works fine, but when i turn the phone off or reboot it, when it then boots again it's back to factory settings, With the "get started" wizard every time. Looks like it can hold on to the configurations in some way. Have any idea how I can fix this?

    Thank you!

    • Kannon Yamada
      July 24, 2016 at 5:23 pm

      I'm not familiar with that model of phone, but dirty flashes are known to cause this kind of issue. A dirty flash occurs when the user does not properly wipe, or prepare, their phone before installing the custom ROM. Elements contained with the system directory oftentimes persist onto the next "fresh" installation. Oftentimes these issues can be corrected by wiping the system and/or data directories just prior to flashing the new ROM. However, sometimes wiping the system directory can itself cause problems. I would try performing a "full" wipe (but don't wipe the bootloader or turn off OEM unlock) just prior to flashing the new ROM. Also make sure to follow the custom ROM instructions to the letter. I can't emphasize this enough -- read and reread the instructions.

  28. shiva kumar.u
    July 24, 2016 at 10:25 am

    reply fast

  29. shiva kumar.u
    July 24, 2016 at 10:24 am

    bro i flashed wrong img and not getting recovery so i factory resest my phinenow its stuck at boot animation

    • Kannon Yamada
      July 24, 2016 at 4:01 pm

      If you flash the wrong ROM, your phone is likely not recoverable. It depends on exactly what kind of IMG file you flashed. Most flashable ROMs contain a lot of different files, which are scripted to install in a specific order. Flashing the wrong IMG can overwrite a critical system component (like the bootloader and recovery), which would make recovering the device impossible. It depends on what files you flashed.

      However, judging from what you've described, I'm unaware of any method of recovery other than JTAG-ing the device.

  30. Anonymous
    July 16, 2016 at 1:36 am

    Please help me! How to repair Nokia X2 RM-1013 lost Bootloader, by up Rom that is a power outage, when I’m not with ATF box. Thanks!

    • Kannon Yamada
      July 17, 2016 at 4:21 am

      A damaged bootloader is a serious problem. Do you have ADB access?

  31. Anonymous
    July 14, 2016 at 10:12 am

    how get recover my phone contact from flashed mobile. my mobile (nokia - XL) dropped on the floor last week display got damaged and changed the display and switched on the mobile it is hanged on nokia logo itself. please help me to recover my phone contact.
    replay as soon as possible with better result

    • Kannon Yamada
      July 15, 2016 at 7:26 pm

      For physical damage, usually the only option is to replace the damaged component. If it doesn't work afterward, it might be because the mainboard (motherboard) is damaged. In this case, recovery may not be possible. You can always try a soft reset by holding down the power button, or attempting to temporarily remove the battery to force a soft reset.

      I'm not sure how to enter recovery mode on your particular handset. I saw some instructions online:

      If you cannot enter the recovery mode, the phone may be broken. Specifically the motherboard might be broken.

  32. Ranjeeth
    July 12, 2016 at 6:00 am

    Hi there, i have galaxy note-2 none of the above scenarios applicable for my problem. Because my phone doesn't show anything on the screen when i press the combination of keys. it is totally dead..

    Any other solutions ? any idea what is the actual problem with phone ?

    • Kannon Yamada
      July 15, 2016 at 7:28 pm

      Have you tried disconnecting the battery? The Note 2 has a removable backplate, meaning you can pop the rear housing off and disconnect the battery. This forces a soft reset of the device, which sometimes helps when trying to enter recovery mode. If that fails, there's not much else I can think of to help you. Have you tried connecting it to a computer? Does the computer recognize the device in Device Manager?

      • Ranjeeth
        July 17, 2016 at 4:15 am

        Hey, i have tried disconnecting-connecting back the battery, connected to the computer- no response, tried entering into the recovery mode with multiple key combinations nothing is working for me..

        Any other ideas ??

        • Kannon Yamada
          July 17, 2016 at 4:18 am

          The only other option that I can think of is that the USB cable or AC adapter has perhaps gone bad. You might want to try charging from another source/cable. If no lights come on, there isn't much you can do, as it is probably the motherboard (or battery) that has gone bad.

  33. arianne bandillo
    July 12, 2016 at 1:12 am

    hi sir. i have huawei g526-l11 it has encryption unsuccessful in screen.. when try to wipe the cache and factory reset it says mount data fail.. what should i do sir? thanks in advance.. :)

    • Kannon Yamada
      July 12, 2016 at 4:43 am

      After encryption fails, you do not want to factory reset, since a factory reset may make the phone unbootable. By "mount" it means it cannot mount the data partition, meaning the phone is now a brick. I'm very sorry.

      I do not know how to recover from this situation, unless you already have a custom recovery installed.

      Someone posted a video of how to fix the encryption fail bug for the Huawei, but it sounds as if you have already tried the steps in the video:

  34. Anonymous
    July 8, 2016 at 12:11 pm

    How to install software plz upload mobile model HTC ONE M7 ..#Kannon Yamada

    • Kannon Yamada
      July 12, 2016 at 12:01 am

      What have you tried so far? The most important thing to try with a phone that's having problems installing software is to enable installation from Unknown sources.

  35. vijay bathvar
    July 8, 2016 at 7:08 am

    hii i have karbon titanium s10. it has software problems like automatic installation of applications. I have reset. but no result. then I wanted to flash it. I have downloaded flash tool file karbon titanium s10 and started step by step loading scatter file and connect phone to pc all got usual. but downloading not starting. what should I do. plz help me.

    • Kannon Yamada
      July 12, 2016 at 12:02 am

      This sounds like issues with the Google Play Store. Can you clarify? What happens when you try to download an application from the Google Play Store? Please guide me through the step-by-step process of what happens.

  36. Lauren Lucas
    July 1, 2016 at 10:59 pm

    I have a Sony Xperia D2005 and i have the dead andriod and i tried everything and it still doesn't work

    • Kannon Yamada
      July 12, 2016 at 12:00 am

      Your device might require replacement. I'm very sorry.

  37. rain@summer
    June 29, 2016 at 10:25 am

    How can i fix corrupted emmc?

    • Kannon Yamada
      July 1, 2016 at 8:28 pm

      That's not a good sign. What methods have you already tried? It could be that the eMMC module is broken, which would require replacing the mainboard.

  38. Varun
    June 13, 2016 at 12:39 pm

    Hello- I have a Google Nexus 9 and it is giving me issues since i upgraded to Android version 6. It always gives message that Google Play services has stopped. this has made the tablet un-usable. Have done factory reset and also re-installing the software. Still the issue remains.
    Got it checked from a technician and he says that the issue is in the motherboard which needs replacement now.

    What are my options and how do i check if the motherboard is actually dead.

    Can you please advise.

    • Kannon Yamada
      June 13, 2016 at 2:55 pm

      That's funny. I just sold my Nexus 9 -- perhaps the greatest and the worst tablet I've ever owned. First and foremost: One of the things you should never do is turn off OEM unlock. The tablet needs to be unlocked at all times in case you need to reflash a factory image. There is never any reason to shut off OEM unlock. If you do and something goes wrong, you stand a very good chance of permanently destroying the tablet.

      Motherboards do not often cause this issue, unless the eMMC module is beginning to fail. While it's unprofessional to doubt the word of a tech, I believe there is a high chance of the technician being wrong.

      The most common problem that causes this is a bad flash (OTAs can suffer from issues) or a dirty/bad flash. Neither of these can be easily corrected unless you fully wipe the system directory. Another option is that the Over-the-Air update has problems. Or you might have just a wonky motherboard that is incompatible with the 6.0 update. I advise that you redownload and reinstall the Nexus 9 factory image. If that fails, try downgrading to the previous version that worked.

      Fortunately, Nexus series devices are very, very easy to restore to factory:

      IMPORTANT: Remember to turn OEM unlocking on. The tablet MUST be unlocked before you mess around with it, otherwise a brick can become permanent.

  39. sagar
    June 5, 2016 at 2:37 am

    While installing a custom Rom it says insatll/SDcard.......
    installation aborted
    plz help to solve this problem.

    • Kannon Yamada
      June 5, 2016 at 3:21 pm

      What is your model of device? Did it show any signs of failure before it stopped working? What kind of symptoms did see, if any?

  40. vahid
    June 4, 2016 at 12:19 am

    hi i,have one vika phone is chaina smart with mt6571 cpu .i do format with volcano box but is dead .i have read file bin format .how to extract boot file or preload file from this file .thank you

    • Kannon Yamada
      June 5, 2016 at 3:22 pm

      You can extract BIN files using special software like IZArc or any number of other software. 7Zip might even be able to do it.

  41. Anonymous
    June 2, 2016 at 1:34 pm

    I was wondering if someone could help me in finding a solution in fixing an alcatel one touch astro pop model 5042T. It's my boyfriends phone and I have been searching the web for help but can't seem to find anything to help. He said when went to update the firmware or software for the phone it started to freeze than he factory reseted it and now you see the dead android with the red triangle and it's bootlooping over and over we tried safe mode it loads when it reaches home screen it states this message "Unfortunately, the process has stopped" and this "Unfortunately, Goggle play services has stopped". Than the screen freezes and it boot loop all over again. I have a macbook so I was trying to see if their was some kind of software that could fix the solution on the phone but still no such help. If anyone has a solution please reply thank you.

    • Kannon Yamada
      June 5, 2016 at 3:20 pm

      That could be a sign of a bad flash. On a lot of phones, it's possible to connect the phone via ADB to a computer and carry out a reinstallation of the firmware in that method. Unfortunately, I am not familiar with how to flash firmware over a OSX system. In general, this is what the flashing process looks like over ADB:

      Unfortunately, it's for a custom ROM, which I do not advise installing. Do you know if Alcatel makes available the firmware for the Astro?

  42. mike
    May 30, 2016 at 7:22 pm

    i have an idol 3, from Alcatel, and I have an issue with my phone being stuck in bootloader.

    I have never made any changes to my phone. and just use the os provided by Alcatel.

    sometimes my phone loads past the bootloader, and goes to the system recovery screen, and sometimes it will boot all the way and work again for a day. Eventually though, it starts getting stuck in a boot loop again.

    the last time i was able to fix it by formatting my sd card, but this time reformatting the sd card did not work.

    can anyone help me figure out what to do?

    • Kannon Yamada
      June 4, 2016 at 2:21 pm

      Unlike a PC, which stores data in volatile memory, a smartphone stores its recovery on its main memory. This is horrible for reliability. If anything happens to the board, it spells death to the device. Intermittant faults are an indicator of a hardware fault. The device sounds defective.

  43. Anonymous
    May 30, 2016 at 11:15 am

    Hello Kannon Yamada,

    Subject: Huawei Y600-U20 - Unable to use Recovery Mode to flash my phone

    I have a Huawei Y600-U20 Smart phone that fails to boot, it stucks at Huawei Logo.

    I had this problem before and i was able to flash it through recovery mode with this firmware Y600-U20_V100R001C456B008_Firmware_Malaysia_Indonesia_Philippines_Others_05021NTQ (SD card).

    Now i cannot use the recovery mode to flash the same firmware, i can enter the recovery mode but the android recovery mode seems faulty, the android robot is displayed but keeps blinking after every few second. There are no command menus displayed as it used to.

    Can anyone help me on how to revive the recovery mode so that i can flash my phone.

    NB: When i connect to the PC/Laptop the same Huawei logo appears. Is there any way to flash the phone?.

    Your assistance is highly appreciated.

    • Kannon Yamada
      June 4, 2016 at 2:13 pm

      There are different procedures for flashing images through the recovery. These methods can vary a great deal between devices. While it is possible that flashing the other image may have corrupted the recovery, it's also possible that the method used to access it has changed.

      • Anonymous
        June 5, 2016 at 3:08 pm

        Thanks for you advice.

        I have just downloaded and installed this firmware from Huawei official website Y600-U20V100R001C435B016_DCC.

        It has changed the Huawei logo and from that of Huawei Ascend but still hangs at boot. Am now confused on how to revive my phone. Should i try to use this dangerous tasks?:
        1. Auto Format Flash with Format whole flash except Bootloader Option or,
        2. Auto Format Flash with Format whole flash option

        Your assistance is highly appreciated.

        • Kannon Yamada
          June 5, 2016 at 3:16 pm

          I'm not familiar with those methods. Anything that touches the bootloader is potentially a way to destroy your device. The "whole flash" option, if it does erase the bootloader, seems to be potentially dangerous. If it just flashes a new bootloader, then it might update the bootloader. But it sounds as if you are not having bootloader issues.

          I'm assuming that you have already read the instructions for operating the bootloader:

          Have you tried any of the other options?

        • Anonymous
          June 5, 2016 at 6:52 pm

          Yes, I have used both the methods many times. As my phone is stuck in logo the only alternative was to use SP Flash Tool, unfortunately no matter what option [Download, Upgrade, Format all} i have been using has not helped me.

        • Kannon Yamada
          June 6, 2016 at 2:08 am

          I don't believe it's supposed to be blinking. That could be a sign of some other issue. Perhaps a failing eMMC module? Or system critical files may have suffered corruption?

          Have you used SP Flash Tool yet? What happened?

          As I understand it, unless you can somehow force the phone into an ADB accessible location, you won't be able to recover. For most phones that cannot boot into the operating system, the only means of recovery is through the bootloader or some kind of recovery partition. If these cannot be accessed, it suggests that the bootloader or recovery environment (or something analogous, like Download mode) is damaged.

          There are JTAG methods, which allow manufacturers to directly access the phone's internal software without establishing an ADB connection. But those are outside of our reach. I'm afraid that there doesn't seem to be a good answer for you. Hopefully you can find some means of resolving this issue. Good luck.

  44. Vince
    May 28, 2016 at 11:07 am

    I Clicked everything in my android device but the bootloop menu won't show up

    • Kannon Yamada
      May 28, 2016 at 2:41 pm

      Do you mean the bootloader menu won't show up? The bootloader menu varies by device. Can I ask what kind of smartphone you have?

      • Anonymous
        July 8, 2016 at 12:10 pm

        How to install software plz upload mobile model HTC ONE M7 ..#Kannon Yamada

  45. Sam
    May 26, 2016 at 3:12 pm


    my Sony xperia M has a custom rom install.It boots in but doesn't go ahead of 'starting android apps...' and again restarting ,recovery is also crash ,and phone is not connecting in " fastboot mode " and not showing in PC device manager also.
    What should i do??

    • Kannon Yamada
      May 26, 2016 at 8:54 pm

      Custom ROMs can have an unpredictable impact on your phone's stability. The majority of the time it is related to improper procedure (just a really minor slip can cause the phone to become unbootable). In this case, it might be because of Sony's design.

      According to a thread on XDA, the Xperia M doesn't have a stock Recovery option:

      I don't know how true that is, but it would mean you'd need to flash a recovery via the command line.

    • Kannon Yamada
      May 28, 2016 at 2:42 pm

      Also, if your device isn't showing up in device manager, you might not have the correct ADB drivers installed. XDA has more information on your particular ADB drivers:

  46. Marcos
    May 25, 2016 at 4:17 pm

    Please, can you help me?

    My S4 Mini Duos I9192 doesn't enter in Download Mode. I put the correct debrick.img in sdcard and turned on. Follow the messages from S4 screen and Odin:

    WRITE 139008 SECTORS
    ddi : mmc_read failed

    Exactly what says by odin:
    Enter CS for MD5..
    Check MD5.. Do not unplug the cable..
    Please wait..
    I9205ZHUCML4_I9205ZZHCML4_I9205ZHUCML4_HOME.tar.md5 is valid.
    Checking MD5 finished Sucessfully..
    Leave CS..
    Odin v.3 engine (ID:3)..
    File analysis..
    Get PIT for mapping..

    There is no PIT partition.
    All threads completed. (succeed 0 / failed 1)
    and on phone it writes this following previous tag :
    MMC: mmc_read fail
    ODIN : flash read failure?

    Wait return. Thanks.

    • Kannon Yamada
      May 25, 2016 at 4:34 pm

      I'm not familiar with debrick.img, but Samsung will use different SoCs for the same model of phone. Do you have any Exynos or Qualcomm S4 Mini?

  47. Nani
    May 25, 2016 at 5:34 am

    i found my moblile samsung i8262 dead while booting through odin..after removing total software phone got flashed for sometime after that it got it is not switching on,not getting heated when i connect to power its not getting charge..nothing displaying..when i connect to pc its showing no device found..when i contacted store they said it wont get repaired as total phone was dead..
    is there any chance to get back my mobile

    • Kannon Yamada
      May 28, 2016 at 1:55 am

      Unfortunately, it seems that your phone is completely dead. It meets all the criteria of a broken phone (not charging, no lights of any kind, not detected when connected to a computer). There's nothing that can be done.

  48. Sanjay
    May 24, 2016 at 11:43 am

    its really very helpful information.....thanks

  49. Anonymous
    May 18, 2016 at 1:20 am

    Sir Yamada, good day. I read this whole post even the comments but it seems I cant find the answer. in my case its - Unbootable Scenario #1: No charging light, not warm after charging, & no Android boot screen except it detects on my Laptop as unknown device that can only be seen in device manager. can't get a hold of it as well since it detects and then just split second it ejects another second it detects again just repeating over and over again.

    • Anonymous
      May 18, 2016 at 1:20 am

      this whole thing started as i completely drained any last bit of my battery and then when i charged my phone it took minutes to pop that charging icon, well everything seems fine till im about to sleep i unplugged and it has a 50-60% battery life, morning comes i went to checked on it and it is still ok but later i checked my phone again its dead. even left for an hour to charge has no sign of that charging icon its not charging anymore. cant even hard reset, #1 . cable is fine( i used many cables and other devices to check) #2. not sure but, the battery seems fine coz when i went to local store to find some batteries they checked my battery and says its fine. i cant buy a new battery if im not sure if the battery is at fault here. (local store doesn't have a battery for my phone have to order it online) please i want to know if this is a motherboard thing as you said "kiss of death" of most phones.

      • Kannon Yamada
        May 18, 2016 at 1:31 am

        May I ask what kind of phone you own? This sounds like a "sleep of death" issue, where simply ejecting the battery can resolve the problem. Unfortunately, most modern phones have non-removable batteries. Oftentimes holding the power button down for 10 seconds or so will resolve this issue, but sometimes this does not resolve sleep of death issues. Either letting the battery discharge on its own or somehow interrupting the flow of power between the battery and the motherboard may work, but I can't tell you much more without knowing a few more details.

        So what kind of phone is it? (sounds like a Samsung) and is it stock or has it been modified in some way?

        • Anonymous
          May 18, 2016 at 1:46 am

          thank you so much for a quick response sir. you've never heard of my phone its a local brand from my country link if you want detailed specification. i've tried removing the battery couple of times and holding the power button for 10 or more seconds. my phone is completely stock not even 1 yr old from the day it was purchased.

        • Anonymous
          May 18, 2016 at 1:47 am

          thank you so much for a quick response sir. you've never heard of my phone its a local brand from my country. i've tried removing the battery couple of times and holding the power button for 10 or more seconds. my phone is completely stock not even 1 yr old from the day it was purchased.

        • Anonymous
          May 18, 2016 at 1:48 am

          its a cubix cube 2, it took me time to reply coz i ddnt know i cant post a link

        • Kannon Yamada
          May 18, 2016 at 1:57 am

          Without the ability to get the phone to the bootloader, there doesn't seem to be a way to perform any kind of reset, hard or soft. It is my recommendation that you return the phone to the seller. Because you have not modified the phone in any way, then fault is clearly with the manufacturer.

          I'm really sorry. It's a horrible feeling when a smartphone goes bad -- especially when it is so new. Are you still within the warranty period? It is apparently a phone from the Philippines. I assume there is a 1 year warranty?

          Regarding its detection in Windows: Even if it is detected by Windows, you cannot engage ADB without somehow enabling ADB on the phone itself. There doesn't seem to be any other option.

        • Anonymous
          May 18, 2016 at 2:13 am

          Its unlikely to make use of its warranty i've ordered this phone online. nonetheless thank you so much Mr. Yamada, I'm an I.T. graduate at least i could understand that much. thank you, but even so if i may add what about the continuously being detected is it some kind of hope perhaps. like i was thinking it might just need some driver to finally recognize my device and then a newly stock rom / firmware can be installed?

        • Anonymous
          May 18, 2016 at 2:19 am

          oh sorry i ddn't read the last part you said about the detection in windows. i see, i think that's it. thank you so much sir.

  50. prakash 144
    May 6, 2016 at 2:52 pm

    my android phone is not switch on.... i use sp flash tool-full formate except boot.... then it is not switch on..

    • Kannon Yamada
      May 7, 2016 at 7:54 pm

      I'm not familiar with MediaTek tools. You might want to check out the XDA forums for your particular model of device.

      • prakash raj
        May 9, 2016 at 3:01 pm

        how to search... (HTC desier 616)

        • Kannon Yamada
          May 18, 2016 at 1:34 am

          I'm not familiar with that specific method of wiping phones. Normally, I recommend performing the factory reset from within the recovery. Have you tried using ADB to reflash the system image or backup?

      • prakash raj
        May 9, 2016 at 3:02 pm

        how to search... (HTC desier 616)

  51. helen campbell
    April 17, 2016 at 10:44 am

    hi my samsung fame s6810p is in some sort of bootloop. it started just after i plugged a charger into it and now happens all the time. it just continuously reboots after a few seconds of being on. it also resets itself as i have tried to delete stuff and move it and it just goes back to where it was before when it reboots.i have tried soft and hard resets as well as using odin on pc to reformat etc...but as with everything else it just goes back to how it was after it reboots. i cant do much with it attached to pc as its on and off before recognised other than when in download or recovery mode...then it remains on but no option to access it from pc in these modes...please help :(

    • Kannon Yamada
      April 17, 2016 at 5:50 pm

      Sorry for your troubles.

      If a hard reset doesn't resolve the issue, there's not a lot that can be done on the user end if the phone is rebooting. If you haven't made any modifications to your device, there's a good chance that the hardware is at fault. Have you modified your device? If so, how?

      If ADB isn't working properly, you might want to check this article out:


      90% of the problems that users suffer when trying to connect to ADB are caused by having the wrong ADB drivers loaded.

      • helen campbell
        April 17, 2016 at 7:11 pm

        hi thanks for your response no i havent made any modifications to the phone. the adb thing is totally confusing me tbh. i will check out this article and give it a go tho. one problem i have is usb debugging wasnt enabled on phone as default turns all developers tools off. so of course it keeps resetting to that even if i try turn them on in the few seconds its on before it reboots.will let u know how i go with this article tho. thanks again

        • Kannon Yamada
          April 17, 2016 at 7:36 pm

          It's my pleasure, but I don't think ADB is going to help in your case. I just looked your phone up. I'm not sure if these instructions are accurate, but this is how you can perform a factory reset:

          I know you mentioned resetting it using Odin, but the link above supplies an alternative method. Hopefully that works.

        • helen campbell
          April 18, 2016 at 9:16 am

          hi i tried that method first lol. well the one that goes to recovery mode. i dont think i have time to diial the number one but i may try it soon. tried the oher link and i got adb thing up with command promp and my device was listed but it said error closed when i tried any command...guessing cause that debugging mode isnt enabled on phone. irritating as all my stuff is there on phone and pc sees phone but i cant open phone onto pc and download its contents or even wipe tthe phone it seems. thanks anyways. totally lost and irritated with it. :(

        • helen campbell
          April 24, 2016 at 6:15 pm

          hello again i have had a new idea of what could be at fault well vaguely and i wondered if you knew anything about it. could it be a hardware issue ie a component on the mainboard and if so which one. wonder this as it did all happen just after i plugged a charger in so thinking maybe the micro usb socket in phone or something near it on mainboard or the obvious the power button part on the mainboard. tried taking middle housing off back and sticking battery against terminals and switching on and its just the same ..ruling out anything contained in middle housing. any info would be great, thanks

        • Kannon Yamada
          April 24, 2016 at 6:29 pm

          That's a very good observation. Different chargers are not built the same and some of the shoddier ones can even damage your device. But even a charger with production issues could be dangerous. An engineer tested a series of basic chargers using an oscilloscope and his results were very interesting:

          The fact that your device began behaving differently after plugging it in suggests that -- perhaps -- the charger may have caused the issue. But I'm curious as to whether or not you've used the stock charger or a third party model. I've known about this and continue to use third party chargers.

        • helen campbell
          April 24, 2016 at 7:04 pm

          i have used both but in this case it was the charger that came with it so stock.

        • Kannon Yamada
          April 24, 2016 at 7:27 pm

          Something might have just given out on the Samsung. Unfortunately, if we look at what's going on -- problem persists through factory resets, soft resets, battery pulls, etc... -- then the only possible cause is hardware. The problem could be caused by the battery or the mainboard. But judging from the symptoms, it sounds exactly like a mainboard issue and mainboard issues are the kiss of death for mobile devices. The individual components on them are not really replaceable and so the entire device can -- at best -- only be sold for parts on eBay or donated to charity.

          Your phone is about three years old. The battery could be the culprit, but normally when it slowly starts to go people notice things like the device crashing after reaching 50% battery life or bizarre jumps in battery life. It rarely goes all at once without showing some signs of failure prior to its going dead. Your phone is 3 years old, though, which can be around when some batteries begin to fail, particularly if they've been left discharged for long periods of time.

        • helen campbell
          April 24, 2016 at 8:06 pm

          hi thanks for response. and phone is only just over a year old. or since i got it and its a contract phone. the factory reset i previous tried didnt work as in phone was exactly as it had been before trying that. with all my stuff still in tack. i would like to keep my stuff and as i said annoyingly i can see it all just only for a few seconds before it reboots itself. i have been looking on ebay and currently waiting for a reply from a soldering service which offers to replace the micro usb port. hoping this would be the problem and that all my stuff could be saved since its still there and i see no need for any factory resets if its not a software issue. and no battery seems fine. even tried different battery in it to check.

        • helen campbell
          May 7, 2016 at 2:25 pm

          hi just to update on this. the soldering service i sent phone to not only didnt fix my phone they also broke it further and now phone doesnt boot past the samsung info and then just sits on that. they said they reflashed it and that there was a mainboard fault rf component or something...but nothing really that i didnt tell them. and i think phone was near a magnet as when it first arrived back it was all over exposed and flashing with lines going down. i now would just really like my stuff off it but of course taht now seems completely no hope since i cant even see my stuff for that few seconds anymore. and also it is now completely unrecognised by pc. moral of story i guess is do not go to third party repairers as they are cowboys who dont care :(

        • Kannon Yamada
          May 7, 2016 at 2:40 pm

          That is really, really awful. I'm sorry Helen. It probably is a mainboard fault, which means the entire board has to be replaced. The cost is probably not worth it at this point. The recovery options for your data are -- at this point -- limited. Oftentimes, the price of recovery + the likelihood of any method working do not justify an investment -- unless the data is very important. In smartphones, the module which stores your data is soldered directly to the motherboard. It's possible to desolder the memory module and place it into an IDENTICAL motherboard, but the cost is very high and the success rate is not very good.

          I'm afraid that I have no good news for you. The soldering service may or may not be at fault as it appears to have been a motherboard failure. That's not an easy failure to recover from.

          Can I ask how much the service charged you?

        • helen campbell
          May 7, 2016 at 2:49 pm

          well i paid the postage to them which was 4-5 pounds and then they invoiced me for the return postage which was 4.50 so they didnt charge me for fixing/breaking it...just the postage and the fact that now its completely broken :(

      • deepak
        May 6, 2016 at 11:01 am

        hi bro i have problem with my huawei honor 6, type 3 problem. its struck on boot loader and it restarts again and again continuously. what to do please help me my email id is

        • Kannon Yamada
          May 7, 2016 at 2:33 pm

          Have you tried using Safe Mode or performing a factory reset from the recovery? Have you done anything to the operating system?

  52. sal
    April 9, 2016 at 10:48 am

    my s3 gt-I9305t is stuck on samsung boot screen, does not boot into rom.cant get into recovery. but, i can get into download mode. i can flash official rom or custom rom through kies or odin. but it just sits on samsung logo screen after reboot. and seem to keep rebooting or untill battery dies. any help would be apreciated. thanks

    • Kannon Yamada
      April 16, 2016 at 8:43 am

      Have you tried restoring an original factory image of an earlier version of your phone? Oftentimes custom ROMs have prerequisites that only the stock ROM has. Unfortunately, I'm not familiar with your model and can't say for certain what ROM you're flashing. You'd have better luck by checking to see if the ROM you're flashing has any requirements, such as needing to be on KitKat before flashing the custom ROM.

    • Anonymous
      April 17, 2016 at 7:13 am

      hey, I've got exactly the same problem as yours, any luck with that? please share with me

  53. Marko
    March 21, 2016 at 9:16 pm

    I wanted to update system on my phone(Alcatel Onetouch Pop D5), and it was rooted when i do that. Now it wount start and always is on recovery meny please help!

    • Kannon Yamada
      April 16, 2016 at 8:46 am

      Have you tried performing a factory reset using the hardware keys?

  54. German
    February 23, 2016 at 6:00 pm

    Hi everyone. Is there a way to recover a tablet from a wrong firmware flashing?.

    I flashed it with a wrong firmware and then when I try to flash again,
    The tablet accept micro sd and tries to load the wright firmware but it get stuck in (WM8850 Android 4.0 upgrading...) and nothing happens.

    The tablet is not recognized by my PC via USB


    • Kannon Yamada
      February 23, 2016 at 11:00 pm

      If you've flashed the wrong firmware -- to my knowledge -- the only recovery option is using JTAG. But not all devices use JTAG. There might be other options out there, but it depends.

  55. Anonymous
    February 10, 2016 at 6:28 pm

    yes my phone in hard brack to install unbrack img
    to start problame

    • Kannon Yamada
      February 10, 2016 at 6:55 pm

      And you can't access a custom recovery? And you also cannot access download mode?

  56. Anonymous
    February 10, 2016 at 6:13 pm

    install custom ROM
    but sam problam
    no warking phone
    power up automatically download moad open (could not do normal boot odin moad)

    • Kannon Yamada
      February 10, 2016 at 6:28 pm

      Did you install a custom recovery? Did you make sure to flash the correct S4 Mini ROM? If the wrong ROM is flashed, it can sometimes (often) make the phone unrecoverable.

  57. Anonymous
    February 10, 2016 at 2:07 pm

    my samsung galaxy s 4 mini gt-i 9192 power up display (could not do normal boot odin moad) to display downloading moad no warking phone no flashing no recovery moad open please help me

    • Kannon Yamada
      February 10, 2016 at 6:06 pm

      What modification have you made to the phone?

  58. sanjeev kumar
    February 10, 2016 at 2:03 pm

    my samsung galaxy s 4 mini gt-i 9192 power up display (could not do normal boot odin moad) to display downloading moad no warking phone no flashing no recovery moad open please help me

    • Kannon Yamada
      February 10, 2016 at 6:05 pm

      Have you installed a custom ROM or custom recovery?

  59. Anonymous
    February 5, 2016 at 12:47 pm

    Your hard reset way is very nice. Share more informative post. I have a blog site related smartphone.

  60. Mikylle
    February 3, 2016 at 6:45 am

    my phone not booting to any fastboot or recovery, it's keeps vibrating when i turn it on or plug into charger, Lenovo A6000 after a failed restoring backup, TWRP

  61. Anonymous
    November 13, 2015 at 1:21 am

    Great article!

    While it is obvious to many of us I think you should insert in large bold print that any option involving a hard or factory reset will make your phone exactly as it was when you opened the box and that all your apps and app data will be gone. The latter may not be obvious to some.

  62. ZapatillaLoca
    November 12, 2015 at 1:17 pm

    Thank you for this very informative article. I found it clear and easy to understand. Certainly worth bookmarking, though hopefully I will never need it.