Please help. My Phantom 3 4K has an IMU Calibration Error that will not go away. I have done the following: 1. Deleted my DJI app and uploaded it again. 2. Updated my firmware. 3. Turned off the drone, gone to the sensors page on the app, then started the drone, click "calibration" on the app, and it says calibration is in progress, but no coordinates change, and the calibration NEVER occurs. Background: I've only had my drone for a few months, flown it about five times and never crashed. One time I was taking off the ground, and there were a few high weeds nearby. When started, the drone caught a high weed and knocked over on its side, but I flew it since the, and it was totally fine. One question, when the IMU Calibration is taking place, does there need to be satellite reception? My understanding is that the IMU Calibration is all about making sure the craft flies level. Again, please help!