$ pwd /Applications/Arduino.app/Contents/Resources/Java/hardware/arduino/firmwares/atmegaxxu2 $ avrdude -p atmega16u2 -F -P usb -c avrispmkii -U flash:w:Arduino-COMBINED-dfu-usbserial-atmega16u2-Uno-Rev3.hex -U lfuse:w:0xFF:m -U hfuse:w:0x…