https://github.com/SpenceKonde/jtag2updi
GitHub - SpenceKonde/jtag2updi: UPDI programmer software for Arduino (targets ATtiny 417 / 814 /...
UPDI programmer software for Arduino (targets ATtiny 417 / 814 / 816 / 817 / 1614 / 1616 / 1617 and similar MCUs) - SpenceKonde/jtag2updi
programmer software