Bart Ruffle's blog: DFU programming the atmega16u2 on the Arduino UNO R3
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Updating the Atmega8U2 and 16U2 on an Uno or Mega2560 Using DFU | Arduino Documentation | Arduino Documentation
ARDUINO- Upgrading USB FIRMWARE using FLIP - YouTube
How to Restore the Arduino UNO R3 ATmega16U2 Firmware Using the Arduino IDE : 4 Steps - Instructables
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