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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
I'm struggling to find out where I put the watch itself now (I have far too many kicking around!) but the advert is https://uk.gearbest.com/smart-watches/pp_009850783162.html - it's definitely nrf52.
The firmware/updater was linked from http://www.chinawatchs.com/no-1-f5-how-to-manually-update-the-firmware/ - I imagine it just has a bunch of old files in there, but the big firmware file (which I imagine is the actual watch firmware) mentions SDK9.
either way, if the firmware updater is that hacky then there's a good chance DFU is unsigned :)