I heard you could boot into programming mode or something if you use pin 0 the wrong way, and I can’t guarantee what state the pin will be in as it boots. It seems the docs are out of date (or at least the back of my pico doesn’t look like that one). I only need one pin, is there a best one to use that won’t step on any other systems?
For the new Picol+, really any except gpio 0, which is on a round pad.