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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.
the1laz
@Gordon
Check out the bottom of the pico page - there are links and commands there, as you need it if you want to replace the Pico's bootloader.
The bootloader will only work if you've got an external crystal though (I think)