Just got my P3 Adv back from DJI, I had a new casing fitted due to motor mount cracks. I noticed that they gave a brand new radio - not sure why as the returned radio worked fine. I had to Link the RC before being able to fire up the DJI GO app so that tells me that the Phantom hadn't been test flown since repair. I updated to the latest 1.6 firmware on the Phantom and the RC is at 1.5.70. I can't for the life of my get the IMU to calibrate, the APP is showing red and says that I need to calibrate. everything else in the app works as normal, the IMU gets to 1% and tells me because of an unknown error the calibration has been aborted. I have also tried going back to 1.5 and even 1.3 firmwares but still get the same errors. I have tried various locations away from all electric equipment and also tried 2 different batteries and letting is fully cool down, but nothing works. Any ideas ?