3.5-RC2 (-v3.px4 version) is now installed on my experimental solo. Installation went fine. It maintained all the parameters I had set with RC1 before thankfully. I had some very funky AHRS issues. Sitting on a level table, it showed an 8 degree roll to the right. Level and accel calibrations failed repeatedly. Rebooted, same, failed. After that I used the reboot action in MP to reboot the pixhawk once more. It booted up level and normal. Passed all level and accel calibrations. Not sure what the deal was with that. But all appears to be well now.
It needs a compass calibration, but won't be doing that until I get out to fly. Which probably won't be until Saturday based on the weather. Snow, cold, and wind says me and dog are staying inside with pasta and beer until Saturday. Well, and going to work.