There has been multiple reports in this forum that the problem can be solved by giving it a knock, either on the craft or directly on the IMU chip. These are just two recent threads on the subject :
Title says it. Just got this for only two weeks, no crash, no hard landing, or hard transporting and I can not get rid of this error that just happened today. Calibrate IMU a million times. Upgrade and downgrade firmware, reset and restart no matter what nothing happens. Is this hardware? I'd...
mavicpilots.com
Hi All, I would just like to share my experience on this issue to all who have encountered it but unable to solve it. I bought my mini during overseas vacation to China. Upon bringing it back home to Singapore and setting it up, i received IMU calibration msg. However, the screen remained...
mavicpilots.com
Inside the IMU is a number of moving masses. If one or more of those masses got stuck due to the crash, the IMU will cease to function. A knock will free them up. No harm to give it a try.