They were loaded with a micronucleus and configured to work with USB. Just a note, if you want to use the pb5 as a gpio you can use usbtiny to reset the fuses, but you'll need a HV programmer to get it back. For that, these are great.
Набор LAFVIN Super Starter для Arduino R3 Mega2560 Mega328 Nano с подробным руководством - совместим с Arduino IDE
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