yeah this thread is old, this is why they downgraded the firmware back, Solo had a hard time with EKF2 and 3DR rather than figure out the issue, just reverted back to older firmware and exited stage left
Thank goodness the community effort never gave up, and we will now see Master Ardu running on solo.
Throw mode should be exciting LOL
I had to do the recalibration twice yesterday after getting the EKF error before two different flights? I flew today and did not have to do it (I flew in the same location today as I did yesterday).