I have a motor drive reversal issue as well. It was working correctly, I did several prints, and then I decided to run firmware update through Cura 3.6 now the motor runs in reverse. the firmware still shows the same number v3.3 -- this is a 2+ extended.
Where can I grab the firmware files to do a manual firmware update? I have already performed a factory reset, but the motor is still running backwards.
Thanks for any tips