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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
Re the output after
save(). I'd be inclined to ensure the board is wiped totally. For this you may need something like "esptool.py", I don't know what flasher.js does with respect to wiping board before flashing