• Ok, I think the firmware update has failed. What device did you do the firmware update from? The IDE?

    The bootloader will still work fine though (hold the button down while putting the button in) and the green LED will light (in fact you just holding the button down may have done it too)

    Please could you try following the steps on https://www.espruino.com/Firmware+Update­#nrf52 ?

    If the Web IDE update failed, using a phone app would likely work just fine


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