Code for the hardware :

• CVM Mainboard GEN2 202410

How to flash using UPDI

On Arduino IDE :

1. Install the board : http://drazzy.com/package_drazzy.com_index.json
2. Upload the sketch Jtag2updi to an arduino uno
3. Shunt the reset pin to the ground with a 4.7uF capacitor
4. Wire the AVR (ex : ATTiny3226) via the pin 6 of the arduino uno (programmer) to the UPDI pin of the AVR trough a 470k resistor

Use Tinymegacore to upload to the atttiny using platformio.

TODO

Datasheet