There is no cmd/sh file with correct command lines and fuses inside the zip for OS2.2,mine OS2.2 is with 12Mhz oscillator,don’t know if there is a difference…
I’ve tried this commands and still can’t upload firmware via osFWupdater!
avrdude -c usbtiny -p m644p -B 250 -F -U lfuse:w:0xFF:m -U hfuse:w:0xDC:m -U efuse:w:0xFD:m -U lock:w:0x0F:m
avrdude -c usbtiny -p m644p -B 1 -F -U flash:w:combined2.1.2_16mhz.hex10x for the help again!