A short guide needed

[avandalen]

Dear Spence

In 2020, we discussed the ATtiny3217, and I had created a guide on programming it, which you can find here: https://avdweb.nl/arduino/attiny3217/bootloader-attiny3217
However, things are changed now, particularly in the UPDI programming method.

I intend to rewrite the page to reflect these changes, but I'm facing difficulty due to the lenght of your guide here: https://github.com/SpenceKonde/AVR-Guidance/blob/master/UPDI/jtag2updi.md
It's become challenging to find the necessary steps for uploading the bootloader to the ATtiny.

Could you please assist me by providing a concise guide, perhaps around 10 lines or so, outlining the bootloader uploading process?

Thank you,
Albert