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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.
@fanoush
there is also "Firmware Update" app in the app loader https://banglejs.com/apps/ , that one may be easier then using DFU. Sadly only next time :-(
Now you really need nrfconnect or nrf toolbox on the phone and just retry.