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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.
@Artiom
I installed nRF Connect on my phone, started puck in red light mode. I see it in the application, I can connect (light turns to green on puck) but no DFU symbol is shown. I just see some properties.