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Correction: the batch file for all newer firmware versions is "flash.bat"
I assume the MOV suppresses the "hum" from the relay? The specs should be available from the part number on it - can you provide it?
Yes, you adjust it with the cover removed, the LCD connected (there is enough slack to do this) and power connected to it. I connected a grounded 120 volt cord with it still on the benchtop to make the adjustment. Just be very careful you don't touch the energized terminals.