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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 just made some changes that should make firmware updates more reliable, or will at the very least make sure they tell you what the error uploading was.
I found it pretty hard to reproduce reliably but did get once or twice. I haven't yet managed anything with the updated code.