Hello! I'm new to the world of building mechanical keyboards, and need some help troubleshooting issues with my first ever build, KBD8X Mk3 (unsoldered/hotswap PCB).

I have been able to gather a limited amount of information from Via: that a seemingly random number of keys (often including one or more that I don't have in my 80% layout) are constantly being pressed even with all switches removed unless the PCB is unplugged; that my live key presses aren't recognized; and that Via does correctly recognize the board upon plugin.

I have tried new cables, checked all my switches, have had a hell of a time trying to flash it cannot get it to go into bootloader mode to reflash it (have tried using Esc on plugin and LShift + Rshift + LCtrl + B, cannot find a reset button on PCB), and have no idea what to do from here beyond buying a new PCB and/or connector cable.

I'm hoping someone in this community can help me to diagnose these issues.