I haven't pulled the rest of the pins out yet (I am aware there are other 3.3 and GNDs) - I thought I would check to see if this is a known possible failure first... I don't think I put any power through it wrong - the board does have a couple of...
I have a T4.1 (fresh out of bag but bought a couple of years ago) and I put headers on it, soldered a lead to the D- and D+ pads, plugged it in via the new outboard USB-C port and the micro B, flashed a test sketch. all worked. So I put it in the...