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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.
ElmerHomero
That's an odd one. Please could you try re-downloading the firmware file from Espruino.com? Also if possible try flashing with another device, and keep the two devices close (1 foot ideally) during the whole process.
On some devices WiFi can really mess with the Bluetooth, so you could always try disabling WiFi on your phone
While it likely will have stopped Bangle.js from booting, it's nothing to worry about. The bootloader will stay on there so as soon as you can send a full firmware it'll start working again.
Also, the initial Bangle.js firmware was loaded wirelessly using that bootloader on your watch - so we know your device is capable of taking a firmware update.