hello,
sorry , we do not have stock for V3.0 and V3.1 control board anymore .
if your printer original board is V3 board , then V4.0 board is not compatible , because the screen connector , and all the cables connector on control board are different .
if change into V4.0 board , may also need change a new screen , lcd cable, extension board , and all the cables on control board into V4.0 version . not sure if need change heatbed also.
even change above items , still can not confirm to you , they will be compatible to make the printer work. Because we do not try this before.
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