I flashed a Redgum to 126.96.36.199, reset to factory settings, and attempted auto-calibration for backlash.
On the first attempt, after completing the auto-calibration I was left with a blank blue screen and the machine was unresponsive.
I power cycled the machine and checked to see if any settings had been saved, all values still read zero.
I reset and saved factory defaults just to be sure and then ran auto-cal again. This time after completing auto-cal, the printer just restarted and didn't save any settings.
Reverted FW to 188.8.131.52 and was able to complete auto-cal without issue.