I recently replaced the GPS on my P2, as the previous one was cracked and malfunctioning. I did have firmware 1.08 on it. After replacing the GPS I took it out and did a test flight and it seemed ok. I checked the dji site and saw that there was a new version for the firmware. I upgraded to v3.12 and now I can't get the motors to start anymore. It just does a slow (2s) yellow blinking on the rear lights. If I try to start the motors, I get 5 red flashes on the rear lights, then it goes back to slow flashing yellow again. I tried recalibrating, hard resetting, recalibrating again, etc to no avail. Batteries are fine. (no, I'm not near an airport) I don't understand what happened. It worked fine before, now nothing. Very frustrating. It seems that I can't even go back to 1.08 either. Does anyone have any ideas what I can do to fix this? Thanks!