I just flashed some new firmware to my typeractive corne (I've done so many times!) but my left (primary) half is now in a seemingly broken state.
I can't get it to output any characters, either over USB or trying to switch to a previously-paired BT device. The nice!view displays an image, but it appears to be rendering once based on its boot state and not updating — if I insert or remove a USB-C cable, the charging status icon doesn't update, and similarly pressing a key that toggles a layer change doesn't update the layer name. The right half's display indicates it's not able to find a BT connection to the left half, assuming the right half is otherwise working properly.
It appears I can successfully get the device to re-enter boot mode, and if I try to re-flashing a previous known good firmware it acts the same as a successful flash (i.e. an OS filesystem error and the USB mass storage device disconnects), but completing that does not change the behavior.
Any tips for debugging?