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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
Hi! There's a bit of a discussion on http://forum.espruino.com/conversations/341425/
Basically you can unscrew the watch, peel back the LCD, then solder on wires for SWD and program a hex file using an SWD programmer like the nRF52DK.
It's not something I can spend much time helping you with, but someone else might write up the process?