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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
You need to switch puck.js to DFU mode first so it is visible as DfuTarg device. Typicaly it is done by holding button, rebooting device (
E.reboot()) and quickly releasing button, check puck.js docs for more details.