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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
Hi,
It looks like the standard firmware update mechanism has failed in your case. You'll just need to go back to the fallback mechanism I'm afraid. The easiest method is to install an app called 'DFU' on your phone.
More info here: https://www.espruino.com/Firmware+Update#nrf52
(ignore the bit at the start about it suggesting you use App Loader, as that won't work now)