A simple and inexpensive way to program new AVR ATtiny214, ATtiny414, ATtiny814 and Atmega microcontrollers using by the UPDI interface - ООО "НПК "Спецтехнаука"
External UPDI Programmer for AVR-IoT WG Board - Hackster.io
Can't even communicate with ATtiny402 via MPLAB Snap? : avr
Cheap AVR UPDI Programmer from ATtiny817 Xplained Mini – Wired && Coded;
Technoblogy - UPDI Programmer Stick
Space-saving FTDI / UPDI connector for the ATtiny3217 and others - Product Design - Arduino Forum