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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@Ollie
I did, I followed all the instructions there. I pencil shorted the button connection, and assume it was was good enough but perhaps it wasn't. Anyway not a problem. I'm up and running with the Pico. Next time I want to update I'll try dfu-util again and try the other approach via the battery.