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customize android deviceAndroid’s openness is one of its greatest strengths and makes it possible for most devices to be modified in a number of ways. Customizing your device can add new features and make it feel like it is, well, yours.

There’s just one problem. The Android modding community is naturally lead by tech-heads and programmers, two groups of people not known for their ability to communicate with the layman. If you ask them what your first steps should be they’ll tell you to unlock your bootloader, root your device and load a ROM. But what does that mean?


customize android device

All electronic devices need fundamental firmware that allows the device to boot. This is often known as the bootloader. It is low-level software that starts the device when you press the power button. Most include fail-safes that restore a device to factory defaults in the event of catastrophic software failure.

Most Android devices come with a bootloader that will only start certain software, such as the ROM (see below) that shipped with the device. Replacing or modifying the original loader is usually required to install custom ROMs.

Some devices have encrypted bootloaders which are much more difficult to circumvent. If you read that a device is “locked” it usually means it is encrypted, which in turn means custom ROMs can’t be flashed until the encryption is circumvented.

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customize android phone

As you might have guessed from the above section, unlocking a device is the process of cracking its bootloader so it can be replaced with another, open, bootloader. There are a lot of different ways to do this and the methods vary from device to device and sometimes even between different versions of the same hardware.

Not all devices can be unlocked. Obviously, a device that’s just been released usually cannot be unlocked for at least a few weeks because Android community members need time to find an exploit or crack that will work. Most phones are eventually unlocked, but that’s not always the case. A device must be unlocked before it can be rooted (see below).

You should note that the term “unlocking” is not very precise. It can be confused with the lock feature used to protect a device from unauthorized access. It also can be confused with phones that are “carrier unlocked,” which means a phone is sold without a contract and can be used with the carrier of your choice.


customize android phone

Android is based on Linux. The deepest level of access available in any Linux operating system is root access. A user with root access can change anything in the system at any time and has access to all features.

Android devices generally do not ship with root access. It’s not necessary for typical functionality and denying root access both improves security and makes modding more difficult. Manufacturers see both as positive results, but many custom ROM features and custom apps won’t work without root enabled.

Obtaining root access is known as rooting. It’s usually achieved by running custom software that exploits vulnerability in the target device. Though potentially complex, some devices enjoy excellent developer support via apps like SuperOneClick How To Root Your Android Phone With SuperOneClick How To Root Your Android Phone With SuperOneClick Read More . Again, I advise checking the XDA Developers forums for your specific device. That’s where you will find the latest and greatest rooting techniques for your Android.

Most Android customizations, including custom ROMs, require a device that has been rooted.


customize android phone

ROM is an example of an acronym that’s taken on a life of its own. It is shorthand for read-only memory, a type of computer memory that can store data for long periods of time but can’t be written to (either due to limitations of the hardware or the software running on it). ROM is where a device stores system files critical to its operation.

In the Android community, however, a ROM is a piece of software loaded into your device which replaces the original Android system files. A custom ROM How To Install A Custom ROM On Your Android How To Install A Custom ROM On Your Android Read More is a customized version of the Android operating system. There are many different versions available from different teams and independent coders. A ROM is not read-only but it does serve as the basis for all of Android’s functions and features.

A comparison to Linux distributions is apt. Linux is an operating system that has many different versions, most of which are crafted by independent programmers or teams. Android, which is based off Linux, is similar. The main difference is Google, which acts as a central driving force and develops the main fork of the operating system. No organization of similar clout exists in the Linux ecosystem.


The term flash is confusing since it might be mistaken for Adobe Flash, which is unrelated. Flashing is instead the term used to describe the installation of a custom ROM.

When you flash a device you install a new ROM on it. This usually consists of loading the ROM file onto a memory card, wiping out the existing ROM installation via the device’s recovery menu and then loading the new ROM.

Exact instructions are more complex, of course, so you should check out the XDA Developers Flashing Guide. You also should check out the XDA Developers device forums. You can usually find device-specific instructions there.


customize android device

A device that’s been bricked has been made useless because of a problem that prevents it from starting. It’s literally as useful as a small plastic-and-glass brick.

Not all bricks are the same, however. A “soft” brick occurs when a device starts but does not completely load Android. It may be a reboot loop (where the device keeps shutting off and restarting, over and over again), display error message or have some other issue. Most soft bricks can be recovered by resetting the phone to factory defaults or using its built-in recovery mode.

A device that does not even begin to boot is called a hard brick. A device with a hard brick has experienced a fundamental failure which may even include damage to the phone’s memory. It’s rare, but it does happen, and replacing hardware in the device is the only way to fix it.


AOSP stands for Android Open Source Project. It’s the project maintained by Google that allows anyone, including both manufacturers and individuals, to build their own version of Android and distribute it.

Downloading the source is easy. Understanding it and using it is hard. You won’t be able to do much with it unless you’re a decent programmer, but it’s nice to know that it’s available. Most importantly for our purposes, a ROM that is “AOSP” or “based on AOSP” tries to closely adhere to the original version of Android, and offer a “pure” Android experience, as close as possible to the one you get with a Google device like the Nexus S phone.

AOKP is shorthand for Android Open Kang Project, the name of a popular open-source custom ROM. The AOKP ROM is a heavily modified version of the original Android ROM, with lots of tweaks added in. It is often used as a basis for other ROMs, so you will sometimes see lists of ROMs with “AOKP” used as a headline. It is unrelated to AOSP but commonly confused because of the similarities in the acronyms.


Hopefully this article has cleared up some of the terms commonly used to describe Android customization. If you have any additional questions feel free to post a comment – or head over to MakeUseOf Answers answers answers Read More .

Image Credit: Sorensiim, Divine Harvester, Andrew Mason, Nick Cowle

  1. Nancy B
    November 12, 2012 at 10:42 pm

    Thanks for giving me a bit of a clue to this.....

    But sounds like something I'd either ask my son about or get him to do!
    I definitely would be too chicken to try this!

  2. Srinivas N
    November 12, 2012 at 7:20 pm

    thanks for shedding light on the topic, Smith..these language was once completely alien to me

  3. Jeremiah Iliffe
    October 28, 2012 at 10:50 am

    I've been rooting and flashing roms since I got my HTC Sensation, I bricked it once but HTC graciously fixed it(albeit with some long shipping waits as I bought it off the internet)

  4. Edward Bellair
    October 16, 2012 at 4:30 pm

    Want to do it. Nervous tho. Money and phones dont grow on trees.

  5. M Read
    October 15, 2012 at 3:19 pm

    You don't say why any of these should be installed on an android phone, i.e. why they are better or more useful than the things they replace.

    You also don't say if there is any chance that installing them will void the phone warranty.

    • Gideon Waxfarb
      October 21, 2012 at 8:13 pm

      Depends on what you want to do. One thing I love about rooting is that it gives users the ability to block ads and wireless tether. Custom roms add all sorts of tweaks and customizations not available to mere mortals :)

      If you do root the phone, you void the warranty. But most of the time, you can unroot and/or flash back to stock if you need to. IMO, the benefits of rooting and custom roms far outweigh the risks involved. It's difficult to hard brick a device, unless you do something monumentally stupid.

  6. Steven Kim
    October 14, 2012 at 11:34 am

    Rooted and installed a custom ROM on my ZTE blade second day after i bought it..Love the new cyanogen mode features compared to the version i bought it with :)

  7. Meidimi Hugo Sokoto
    October 13, 2012 at 6:31 pm

    got my galaxy nexus a few months back and was abit scared to root incase i bricked it but got over the fear and did it anyway. i can do so much with it now. its awesome. next is to try a different rom on it.

  8. Idan Tovim
    October 13, 2012 at 3:13 pm

    CM9 is the best ROM I know. I tried many, This is by far the best

  9. Jacob Mathew
    October 13, 2012 at 5:27 am

    I bought my android about 7 months ago.Had a friend root it for me.Works fine.

  10. Edwin Williams
    October 12, 2012 at 9:54 pm

    Looks great! I rooted my Kindle Fire when I got it about 5 months ago and I love it!

  11. Richard Borkovec
    October 12, 2012 at 7:23 pm

    I bought a Galaxy Exhibit 4G, and the first thing I did was root it. I tried a few different ROMs, but settled on RebelROM. It's fast, looks like ICS, and gets rid of the Samsung bloat.

    • Vince
      January 2, 2013 at 2:25 am

      i still dont know how to do this man how do i flash my phone?? how do i get a new rom???

  12. Alex Perkins
    October 12, 2012 at 5:37 pm

    I rooted my SGS2 4 months ago and can't believe I didn't do it sooner, I did soft brick it the first time, but the next day I tried again and then I had Root access, number 1 on my list was to remove the bloatware Samsung put on it, like a demo of Monopoly and a very low res version of something resembling the sims.

  13. Bumferry Hogart
    October 12, 2012 at 5:16 pm

    I have had my android for 11 months have always chickenend out of rooting the phone for fear of ruining and therefore wasting my hard earned cash.
    however, the temptation is growing and the more articles I see like this, the more I think about going for it.... but not quite yet.
    nice article.

    • David Fielder
      October 16, 2012 at 2:30 pm

      I'm with you on the chickening out part. It's like the first time I jailbroke my iphones, when I had them. I was scared to do it mainly because it was "illegal" in my eyes. I'm afraid of messing up my expensive phone that I can't replace for cheap or for 2 years.

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