Mini UPDI programmer (jtag2updi) for the new tinyAVR 0- and 1-series microcontrollers based on the ATtiny1604/1614. Program the new ATtiny devices with a new ATtiny device!
How to use a UPDI programmer video: https://youtu.be/OVSLsA9-gF0
More information and firmware: https://github.com/ElTangas/jtag2updi
Getting started with the new ATtiny chips: http://www.technoblogy.com/show?2OCH