Hi, The AVR core was removed from the main arduino/Arduino GitHub repository, and moved to a separate repository arduino/ArduinoCore-avr . However, the DFU Programming 8U2 page still points to the arduino/Arduino repo as the place to get the ATmega16U2/8U2 firmwares for the UNO and MEGA boards: D…

Dead firmware link on "DFU Programming 8U2" page

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