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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
As above, you're connecting to 'Puck.js abcd' not 'DfuTarg' - I imagine the green LED isn't lit up?
There's quite a thorough writeup on https://www.espruino.com/Firmware+Update#nrf52