I am getting a error when trying to calibrate the IMU, after The copter took a hard landing.   The error is,   "IMU calbrstion failed, temperature out of safe calibration range".   I have tried cooling the copter and then calibrating, but same error.   

I am the second owner and no original receipt.   I am wondering if there is any thing else I can try.    If not,   Can someone tell me if the IMU is on the smaller controller board, or on the main board?

Thanks,  Kevin
Westminster, Colorado

Hi, Kevin.
Since the drone took a hard landing.
I'd suggest you to get in touch with tech support via support.us@dji.com and send it in for further evaluation.