Hi Gregor, Refer to discussion at [1]. I don't have enough time at the moment. Would you be able to test the latest upstream avrdude and see if it works without needing to change anything on boards.txt?
[1]: https://github.com/arduino/ArduinoCore-avr/issues/436#issuecomment-968348411 Thanks a lot, -- Rock Storm Open PGP: C304 34B3 632C 464C 2FAF C741 0439 CF52 C968 32FD
