I’d say two things, one look at the checkbits, most are bad, specifically the mag (this fw is also pre emergency yaw recovery estimator IIRC - pretty sure though) and the Mag was calibrated prior to flight (it’s in the logged messages) but as Jim pointed out, the vibration is incredibly high, too high. Likely something was loose. Unlikely a prop on upside since it is a quad and flew for a moment. Also, who knows what the customer did from the time it crashed to the subsequent log. There is absolutely no vibration in that one. Something had to be tightened, checked, etc. I’d check the mag and replace it if any doubt, use the newer firmware which has the emergency yaw recovery https://github.com/PX4/PX4-ECL/pull/754 and most likely, ensure everything is strapped down. A roll like that with that level of vibration is going to just swamp the onboard sensors. You could put a secondary mag on there as well but there isn’t any real interference TBH.