I just ran in to this issue my low volume button wuz jammed I messed with it and den I held the low volume button down at the same time wit the power button n den I notice my fone turned on n now I'm able to use it n no more FTM on my screen I waznt able to turn my fone on or off but after I tried dis my fone iz now working hope dis helps u out dere n my fone is a non removable battery