+ ATMEL-ICE и https://aliexpress …311.0.0.309e33edmnWbge
Note: Older AVR devices have a programming interface, known as "High-Voltage Programming" (both
serial and parallel variants exist.) In general this interface requires 12V to be applied to the /RESET pin
for the duration of the programming session. The UPDI interface is an entirely different interface. The
UPDI pin is primarily a programming and debugging pin, which can be fused to have an alternative
function (/RESET or GPIO). If the alternative function is selected then a 12V pulse is required on that pin
in order to re-activate the UPDI functionality. и т.д Ну и плюс SN74LVC2G07 и sn74lvc1t45_TAF _BUF_ICE - выходные буферы,если что-то пошло не так