Hit tree branch approx. 10 feet high, was in sport mode. Only outer damage was one prop tip snapped off. It looked like it only hit leaves on branch. I had just turned around to fly back so it had not time to to get any speed up. So was not a high speed impact. It fell to the ground and stopped. Replaced the prop few days later and turned everything on and got imu error. Went to Imu calibration. Pressed start one the app and nothing happens. The mavic air is powered up. Need help, I do have DJI refresh.