Got my boards (yey!) and soldered the ATTiny841 and an ISP 6 pin header on, plugged it in, selected "ATTiny 441/841 (No bootloader)" from the ATTinyCore options. Burt the bootloader...no issues. Well.. avrdude: set SCK frequency to 187500 Hz avrdude: warning: cannot set sck period. please check f…

ATTiny841 with USBASP

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