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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
Just to link up, you filed an issue for this on https://github.com/espruino/EspruinoTools/issues/113 as well
Unfortunately CLI-based bluetooth firmware update isn't supported in EspruinoTools at the moment.
If you need to use CLI to do it, it's easiest just to use https://www.npmjs.com/package/web-bluetooth-dfu - which should do command-line firmware updates for you. Worth noting that especially on Linux it'll be quite a bit slower than the Android method