Even with issues with one or now two of my M4s, I've decided to move forward.
I built up my LadyBird based M4 and when I got to the point of arming the M4. I couldn't get it to work. So I decided to try a few different things. Here are my findings... Moving rudder/yaw stick to lower left armed M4, not lower right like documentation says. Then when I went to try and do on-board magnetic calibration I couldn't get it to go with Yaw/Throttle - lower left and Roll/Pitch - upper left. I found going with Yaw/Throttle - lower right and Roll/Pitch - lower right got me into magnetic calibration. I couldn't figure out how to get Tare to work. Did something change or is my setup somehow completely wrong?