After 3 frustrating days after upgrading the firmware to v1.6 my Ph3P is ready to fly again........
Initially I lost all functionality in both the ISO and the aircraft. I tried downloading and installing v1.5 but the aircraft would not accept that input. So, I deleted the Go app from my
air2 iPad and reloaded a new app; next I reloaded v1.6 into the aircraft and initially everything seemed A, OK........ not so fast..... I had an intermittent "calibrate IMU" message.
Thanks to the forum here I found out how to do that - I STRONGLY RECOMMEND THAT EVERYONE DOES THIS AFTER A FIRMWARE UPDATE....... every time. After I did the IMU calibration the system works great and I'm back in the air again. It was also recommended that I calibrate the gimble after the IMU - this I did as well. DJI help was a little slow on the uptake helping, however they also recommended the IMU calibration.
Hope this helps.