Hey man, yeah, I calibrated IMU and compass before I flew. I have downgraded and not getting the error, but am yet to fly it. Im heading to a more open place shortly to give it a go!
I've gotten the same error today. I upgraded to the new software and things haven't been the same. I got the ultrasound module error, and then didn't fly. After turning off and back on the error wasn't there. But I flew and it would only lef me go up about 10meters and would reach its altitude...
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