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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.
@Gordon
One is just the bootloader (which can't get updated by the firmware updater anyway), and the other is a bit tricky - depending on whether you ran
create_pico_image_1v3.shormakeit's either the full image (both bootloader and espruino firmware) or it's just the (un-offset) espruino firmware.