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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
Can you explain what's not working for you? If you follow the steps for DFU mode at https://www.espruino.com/Firmware+Update#nrf52 can you see the bangle appear as a device named
DfuTargin the DFU app?