3.10.0-RC1 Firmware corrected MK2.5S XYZ calibration fail on Point 4  

3.10.0-RC1 Firmware corrected MK2.5S XYZ calibration fail on Point 4

Hi everyone

I just finished upgrading my MK2.5S Y-axis structure and performed routine maintenance of greasing the linear bearings, tightening bolts connector setscrews, etc... put it all together and "Fail XYZ Calibration" right after calibration point 4.  The firmware was 3.9.3 final.

Tried it a couple of times, same stuff. Tried factory reset - same thing.  Got out calipers, tape measure and ruler... this thing is straight , level and square.  Tried shifting the frame on the Y-axis- go too far forward and it fails on Point 1, shifting it too far back makes no change.   What gives? 

Then I tried the new 3.10.0-RC1 firmware with the improved XYZ calibration.   Passed first time, with no measurable skew, though Y offset is at -6 on both sides.  Whew!  

Thanks for this new firmware.... came out just in time!