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Can you give more details about this, please? I have TMC2208 v2.1 and v2.0 from BTT.

As I'm a newbie on this Mega hack I would like to know if you need to do extra physical wiring for the UART mode.
From what I read so far for UART mode I need to do some soldering on the TMC board joints but I'm afraid there are other things to be done like re-arranging some of the pin head from bottom to the top and the extra wiring.