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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.
@Ivor
Yes, that is the firmware you need. The building guide is https://github.com/espruino/Espruino/blob/master/README_Building.md building in your case with a BOARDNAME of BANGLEJS2, that will build the bootloader and espruino interpreter to install (along with the bare minimum bootstrap apps)
Once those are up and running then the functionality and apps are provided from: https://github.com/espruino/BangleApps again there is a readme there with a lot of information on how you can build your own and/or create your own forked "app store" to use.