The ATmega4809 chip is programmed through its UPDI pin unlike, for example, the earlier generation ATmega328p as found on say the Uno which do use SPI for programming.
Are you using your own board design?
The ATmega4809 chip is programmed through its UPDI pin unlike, for example, the earlier generation ATmega328p as found on say the Uno which do use SPI for programming.
Are you using your own board design?