The drone should land on a rock from which it started. She did not recognize the ground (rocks) and did not land but slipped and fell between the rocks. Since then, IMU always appears to calibrate. But when I press Start to calibrate, nothing happens ...

Hi Toto1973, we're sorry to read the crash. I'm afraid that the performance cannot be ensured after the crash. It is recommended to start a case and send the unit in for diagnosis: https://www.dji.com/support thanks!