I did the 4.2 upgrade and took it for a flight. It was OK but danced around a little more than usual. I then found out I needed to incorporate the default settings from the DJI site. I did but all I could find was a ZIP file for the 4.0 default right in with the 4.2 stuff so I used it. I installed it and now I get an error 27message and if you look at the compass Mod #s, in the Tools tab you will see the compass is way out of the normal calibration count of 1400 or 1500. It now shows 375.7. The compass was OK until I did the default install. Please help, what should I do. I know I could try to readjust the compass with a magnet but this did not go so far out until the firmware change. Has anybody seen this and what did you do to fix. Please respond, please.