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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
Do you have any way of getting hold of a volt meter? The only other person that reported having this problem did actually have 2 flat batteries when they tested.
If it is broken I'm happy to replace it, but it seems amazingly unlikely - even in the case that the firmware upload failed, you should be able to get into bootloader mode by inserting the battery with the button held down