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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.
@Ollie
Puck enters DFU mode for flashing. I'm not familiar with the code but maybe UART service is not available/advertised in this mode?
In any event I don't believe it is currently possible to update firmware using this approach. Get hold of nRF Toolbox app for iOS and Android.