How can I recover lost SMS/photo/video/contact from Android phone because I lost all data by system upgrade. Please help me!
Yes, as long as your phone can connect with computer, and scanned by the third party recovery software. MiniTool Power Data Recovery is recommended.
is the size of the disk space is as it was when full of your files, if yes then try another file manager like astro file manager and see if you can locate your files (may be they are hidden somehow).