after a long fight with my M9C Pro s905x which was totaly bricked (always with red light whatever you do), i manage to restart it with a stock TX3 rom.
Impossible to flash the box with any TVStock rom i find in this great forum. Always an error with sdcard update or burning tool, and back to brick mode.
if someone knows a rom which works on this particular box, tell me about it please !!
THX