Tried to fly and drone would not arm. Investigating later, saw qgc message ‘velocity estimate error’ keeping it from flying. Checked for loose connectors (none). Then I was looking around in qgc for clues to error, and somewhere I changed some parameter(s). Now whenever apply power get buzzer alarm and flashing lights. How to troubleshoot and restore/fix?
A couple of things to look out for with this error. One thing could be a poor calibration. This can be caused with metal objects around or anything that may lead to interference. I have also seen when taking off in an area that may have metal objects that can cause interference. Please reference this page and let us know if you can pinpoint any of the error tones: