I just got my Model 01 today, and I’m loving it!
Before customizing any firmware, I played with the LED modes, and they all seemed to work very well. Then I started to play with the firmware, trying out different key mappings. Eventually I found a layout that I liked, but noted that when I pressed the LED button more than a couple of times, (specifically, when I get to the blue and red spinny light pattern) the right half of the keyboard shows a blue light below the minus key on the bottom left, and all keys on the right half of the keyboard stop sending any keypress signals until the keyboard is unplugged, and plugged back in.
I tried making a new sketch with the original firmware template (as far as I can tell it’s the original unmodified firmware). I flashed that to the keyboard, and indeed, the original layout is there, but the LED problem persists. I haven’t been able to get the keyboard back to a normal state where any of the LED patterns work without killing the right half of the keyboard. Any tips?