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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
So yes, you can flash whatever you want.
If you want to use Espruino signing key then that's actually public in the Espruino GitHub repo.
Obviously it's a bit of a security issue so we've disabled buttonless DFU - you have to be physically with the Bangle to press the correct buttons to reboot it into bootloader mode first.