hello, we do not have stock for V3.0 V3.1 control board anymore.
not sure if V4.0 board will be compatible or not , if you would like to try it ,
need replace control board , lcd screen, extension board , and all the cables like x axis cable, y axis cable etc on main board into V4.0 version cables
even change these items , still can not confirm to you that they will be compatible as we do not try it .
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