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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.
user65682
@stevie4711
Did you use it before and maybe flash something different? If yes, then remove the battery and press the button. Then put in the battery again and within 3 seconds release the button. Then it would omit any program you may have on the puck.
Otherwise I would try re-installing the firmware. The procedure is documentation in the getting started.