Your model was made before this was implemented and if your IMU is bad you can simply replace it without serialization.
Make sure your Battery is above 50 percent or the calibration will most likely fail. (the drone knows lol)
If you are trying...
It is very important that you DO NOT tell them you are a commercial pilot or that the drone in question was ever used commercially, even if the flight was for Hobby. They will not insure or pay for the drone if ever connected with commercial use.
That’s essentially the delay I saw. It did not immediately trigger a return to home. It tells you what it is doing when returning and I didn’t hear or see anything in the meantime - scary when it happens.