![]() It runs software called firmware (so named because you couldn't change it once it had been programmed in the chip) that can be updated through a special USB protocol called DFU (Device Firmware Update). Previous versions of the Uno and Mega2560 had an Atmega8U2. ![]() The ATmega16U2 chip on your Arduino board acts as a bridge between the computer's USB port and the main processor's serial port. Updating the Atmega8U2 and 16U2 on an Uno or Mega2560 using DFU
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