Latest Mars Firmware Release - V4.2.19_LCDM /1440x2560 /F2.7

[Hywel]

I upgraded firmware to 4.3.4 based on the link in the forum and I want to go back to the prior release because I'm having weird printing issues now (I home the build plate, start printing and I hear a grinding noise as if the motor is trying to move the build plate below home).  I did not do this before the firmware upgrade.

Downloading 4.2.19_1 says I have to apply one patch or another based on my batch number (or something) on the bottom of the printer.  Trouble is whats under my printer doesn't match either of the batches in the release note.  It says: M1720191202 C

Any thoughts?

Thanks