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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
Try putting the battery in with the button held down, then releasing it right away (the LED should stay red) - that'll put it into Bootloader mode.
Does it appear via
nRF connectasDfuTargwhen you do that? Is so, maybe try updating the firmare on it?