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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
Yeah, you'll struggle building Espruino for SDK11. Since you've backed up all of flash I'm pretty sure you're fine though - you could always back up UICR as well I think.
It depends how much you think your time is worth I guess. You could spend the next 3 weeks messing around with SDK11 in case you brick a $15 watch, or you could just overwrite everything and see what happens :)