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3

The ATMega328P datasheet has the following table in it: The top 5 bits of the of the Extended Fuse Byte are default 1 and are reserved. You're not really supposed to change them, since they might be used in the future for a 328P-like part and setting them to something other than 1 could have unexpected results. In the 328PB variant bit number 3 is used ...


6

It's enforcing this line from the arduino:avr boards.txt nano.menu.cpu.atmega328.upload.maximum_size=30720 To be clear, the board is assumed to have a bootloader, even if you're not using it to get the code onto the board, that is upload via programmer. You could edit that and change some fuses yourself. But you could also probably just use MCUdude ...


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