Is there a way to know whether an mk logic board is working without Drivers hooked up I have an mk logic board that I flashed with the most recent firmware but no leds light up nor do any button presses register in any apps or monome test. My mk has a serial m0000013 and shows up as monome i2c in the serialosc and in monome test properly shows as 16x8 as I flashed it. Ideas? @tehn, when I stop serialosc and try to use the bootloader method you mention I get: avrdude.exe: stk500_getsync(): not in sync: resp=0x81 avrdude.exe done. Thank you. make: *** [16x8] Error 1 Not sure what is going on. I tried stopping serialosc and using the other protocol mtest you attached and it automatically identifies my device on Port COM2 (Windows 7 32 bit) but I get no response from pressing buttons or clicking on the grids or any of the message boxes. I have an AVRISP mkii here that I can use as well. Another question, I was using the older version of serialosc before. Was it serialosc that was seeing the mk as an i2c device? Or was that because of the serial format. I followed the firmware instructions but used my avr to program the firmware before and I figured since it was seen as an i2c that at least some part of the 325 must be working properly. My task manager shows a new serialoscd instance running when I plug in the