It seems like the gimbal was broken due to the force of the impact that broke its arm as well. It would work in the first few seconds because it was testing whether the gimbal works fine by turning it to its extremes. If it can't do that then it would stop and leave a gimbal error. I once had the same problem as you when I was trying to get some videos in a forest. Turns out it was a stupid idea to fly a drone in a place where trees are everywhere. Anyway, my gimbal also worked just fine, I tested all the motors and nothing is stuck. However, when I booted the drone, it showed the same messages as you and refuses to take off. Calibration would start and stop halfway through.[br]
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Unfortunately, there's nothing you can do about it except taking it toDJI. DJI has indeed looked us all out of independent repairs with their crappy software that's even more disgusting than Apple's parts paring, and only their official calibration software can calibrate the drone. [br]
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However, you might want to check for debris that somehow got into the motors which stops it from turning properly, and also get some new mounting brackets and swap the old ones out it could be a deformed mounting bracket that had somehow caused the problem. [br]
This:[br]
[image|3633784]
[image|3633783]
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That might solve the problem.[br]
Good luck with your repair!