Comment by jchw

On that note, Picoboot is also amazing. I've set up Picoboot on multiple GameCubes and even a Triforce (an arcade machine platform which has a DOL-001 mainboard strapped into it.) It does require a bit of soldering, and if you want to power the Pico properly instead of abusing the 3.3V pins, that requires a bit more care. But, it's not very many pins to solder, so as long as you are careful not to burn anything it's actually quite approachable for beginners.

(I never bothered with powering any of them from 5V so far and it has been fine so I'm guessing it's usually OK. I have plenty of backup Picos in case one of them gets blown up.)