I fried one that I'd flashed with Debian while trying to force EDL mode.
RE: UART: I can say that when the gold pads are at the "top", the one on the right is UART TX. However, it mostly just showed me constantly entering lk2nd.
There doesn't seem to be:
- A way to force EDL on this particular stick. (I've tried bridging D+ and GND and can't get any change in behavior) Other boards supposedly enter EDL if you hold the RESET switch while powering on, but that also doesn't seem to work for me.
- The lk2nd is patched to enter recovery/fastboot on certain button presses, but I can't find any way to trigger those buttons on this board. (and like I said, fried one in the process). I suspect these mappings are slightly different per board variant.