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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.
user109783
@AkosLukacs
First guess is either
https://www.espruino.com/Troubleshooting#i-typed-save-but-espruino-won-t-work-or-stops-working-quickly-when-powered-from-a-computer-it-only-works-from-a-usb-power-supply-battery-or-the-computer-when-the-web-ide-is-running-
or
https://www.espruino.com/Troubleshooting#espruino-works-when-connected-to-a-computer-but-stops-when-powered-from-something-else