Geeetech

Doesnt work on my board. wheb you put the cap on those pins rx/tx lights go off. Wheb you remove the cap both come back on. windows can not reconize it.

I am having the same issues.
Rx/Tx lights are on constantly , Win10 and Win7 machines wont recognize it. Won't go into dfu mode.

It will be a problem with the pin alignment in marlin. It will be configured like a 2nd z motor ie. Prusa, 2 z motors.
I have the same problem.