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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
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