https://hackaday.io/project/134831-atmega4809-developing-board-project/log/145848-arduino-uno-as-updi-programmer-for-atmega4809

oh boi

https://www.microchip.com/webdoc/GUID-DDB0017E-84E3-4E77-AAE9-7AC4290E5E8B/index.html?GUID-9B349315-2842-4189-B88C-49F4E1055D7F