I recently bought a used x0xb0x that arrived dead. It appears to be an original adafruit x0x. At least the pcb looks identical to the one in my official adafruit x0x.
I touched up a bunch of solder joints (didn't find anything bridged) and put in my original adafruit (from my other kit) and it works mostly.
The mode knob appears to do nothing in the following positions:
My computer can see the USB chip, but does not see the x0xb0x.
Any thoughts on this? Where do I go from here?