I have found similar threads but no solutions so far. I am trying to fix my friend's P3 Pro. He updated the FW to 1.6.0040 in the aircraft by following the DJI instructions but now the gimbal is limp and there is no video. The drone can still fly. On the DJI Go app, About Screen, the aircraft and version is "N/A". I tried to re-install the FW. The LED on the gimbal blinks green and red for several minutes then it goes dark...forever. The two front LEDs are solid red, the two rear LEDs are blinking yellow, the gimbal is limp and it stays this way (for over an hour until I shut it off). I pulled the SD card and there is no text file, hidden or not. It is as though it stopped midway and just bailed. I then tried to downgrade the FW to 1.3.20 and the same thing happened (nothing at all). In the pdf instructions, it states that you have to use the DJI Go app to upgrade the aircraft but the controller must be off. Two things that do not make sense...there is no SD card slot in the Google Nexus using the DJI Go app and a laptop is better for downloading, unzipping and installing the .bin file anyway. The instructions conflict with reality. Is this gimbal bricked now? Or is there another method to connect directly from my laptop to the aircraft via USB and a software application to flash it directly? It seems that the DJI Assistant software is for older models.