sister has a GT-9250IM everytime she opens an app the phone crashed. the cel provider erased the cache and it still does it. I want to wipe it clean and start over. I tried going into the phone and wiping it sometimes is restarts, sometime it goes into a black screen with a dead looking android with an opened chest and a red yield sign then restarts. tried hard reboot....hold down volume then press power takes me to a reboot screen without any options except start which takes me to a rebooted home screen. Any ideas??????