A simple and inexpensive way to program new AVR ATtiny214, ATtiny414, ATtiny814 and Atmega microcontrollers using by the UPDI interface - ООО "НПК "Спецтехнаука"
Upgrading Your ATtiny85 Projects — An ATtiny412 Tutorial | by Lesther B. | Medium
Atmel-ICE The Atmel-ICE Debugger
Atmel-ICE to Arduino Uno Connection via ICSP Header
Programming AtTiny 1614 with Atmel-ICE and Arduino IDE | AVR Freaks