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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
@tage did you try booting with BTN1 held down? Theres a note on the flashing page, but when firmware changes a lot then the saved code from an older version can cause the new version to crash while it is booting.
It doesn't happen on the Espruino board because the bootloader makes sure that saved code gets erased.