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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
Were you doing anything else? Did you connect any other hardware?
It's also worth trying another USB lead - just in case. Sometimes they can have dodgy connections.
Seems very strange that it would just stop working of its own accord.
Do you have a USB-TTL converter? If so you can re-load the bootloader and Espruino pretty easily assuming the chip itself didn't get broken somehow