I sold my Android phone recently, which was only 3 months old and in perfect condition. However, the person I sold it to was using it for around a month without any problems. Then all of a sudden he said the phone was stuck on the Android logo/Boot up screen and does not go to the Swipe screen to unlock screen. I am assuming he has tried to root the phone or install, flash a custom ROM, but messed it up. Is it possible to find out whether or not someone has attempted (incorrectly) to root the phone or install a custom ROM, causing it to be stuck on the boot menu, by looking at the phone? Note: Power ON + Volume Up/Down is still functional on the phone. Or is there another possible reason as to why this could of happened?