No support for NVMv3 devices such as AVR-EA and AVR-EB

[MCUdude]

It turns out that the AVR-EA and AVR-EB utilize NVMv3, which is currently not supported by jtag2updi.

Even though there exist several DIY UPDI programmer solutions, it would be great to have jtag2updi support for the latest and greatest AVRs.

@askn37 has created updi4avr, which (I think is) based on the jtag2updi firmware, but requires a tinyAVR-2 or greater as the hust MCU. the updi4avr already supports NVMv3. What's so great about the jtag2updi project is that you can flash a "regular" Arduino and turn it into a full-blown UPDI programmer!

https://github.com/askn37/multix-zinnia-updi4avr-firmware-builder/blob/main/libraries/UPDI4AVR/examples/UPDI4AVR_FW753B/src/NVM.cpp#L559