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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
Best to look at Bangle.js as I believe that starts the bootloader at 0x7a000. I'm pretty sure you just need a modified linker file.
However the bootloader is more or less Nordic's own one (just with some LCD handling added) - you should be able to find a bunch of info on Nordic's site and forums.