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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
Which application/tool did you use to perform the update?
Could you try entering the bootloader mode again, and trying to update the firmware again?
So apply power with the button help down and release it while the green LED is lit.
You should then be able to re-flash the firmware to it and everything will work fine.