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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.
@Programbo
That was happening when trying to upload modified code to the same firmware! Espruino already explicitly prevents running code uploaded on a different firmware version. I used that feature to save me because switching firmware would stop my software serial code from automatically running so I could upload safe code before bringing it back to v2.00 :D