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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
Nice - thanks!
Interestingly Shenzhen DO Intelligent Technology were the maker of that first watch (right at the start of this thread) that I ran Espruino on - unfortunately they were completely not interested in doing custom firmwares.
However, with those older devices on SDK11 and unsigned then as you say it'd be possible to just update the firmwares wirelessly without even opening them.