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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
The random characters at the beginning is "normal", I think those are boot messages or something like that.
IIRC connecting with putty did not work for me either, but the Web Ide should be able to connect to it. Is your board working properly, did you try with something else? Does it have enough power, maybe try adding a bulk capacitor?