To make it work, just change the wiring of ICSP header PINs of NFC shield: Wire female ICSP PINs of NFC shield to the appropriate female PINs of Arduino Mega/ADK shield: SCK (ICSP NFC) -> 52 (Mega) ...

Keep in mind that you should short the GND and ICSP pins, as demonstrated above. python pwnduino.py --flash To unflash, use --unflash. Once again, short the pins. You will now have a regular serial ...