So I just got my drone a week ago almost.  Flew today with no issues, did firmware update. Went to take it out this evening and got controller error message. Told me needed to calibrate IMu. When I try it goes to 1% then tells me unknown error.  I am beyond frustrated.  Any suggestions

Are you putting it on a flat level surface and have no movement or vibrations?  even walking by can shake the floor a little

Did you check the IMU first yet,if you want to calibrate ? If you do that first then you ´ll get a message "Calibration not required" or "Restart the AC and calibrate the IMU".