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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.
@AkosLukacs
Check http://www.espruino.com/Troubleshooting#i-typed-save-but-my-connected-device-doesn-t-work-at-power-on
and the next two items in the troubleshooting.
Do you have any
console.logorprintin your code?