sorry, we do not have V3.0 and V3.1 board anymore .
not sure if V4.0 board can be compatible or not , need change control board , extension board , screen , lcd cable and all the cables on control board into V4.0 version .
but even change these items, still can not confirm it can work normally or not. not sure if there is any other difference will cause uncompatibility,like basement structure.
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