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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.
@HughB
It looks like the firmware is corrupted. It is possible to do this if you upload a file to FLASH using the Web IDE. Its a bit too easy to do this. If you can connect through the IDE try typing 'Bangle.factoryReset();' in the left hand side. See what happens. Then try reflashing the latest firmware. To do that you need to be able to get your Bangle to reboot to the DFU screen. Gordon has done a good video on this.
Dont worry - its pretty hard to brick these watches and as long as you can get Bluetooth connectivity you can usually recover them.