hello i have the problem too, i update firmware like in this video i have blinking buttons and stuck on logo, then when i made update v10c use this on my p350 and hes start doing that and stop after some time and show upgrade error wparam 100 and Lparam6 and i have total black screen, i take out baterry, then put it back, but hes die! nothing hapening total black screen no emergency mode no blinking and logo nothing... what i can do ? know maybe where is the problem ?