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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.
user66681
Are you using esptool to flash? Maybe do "erase_flash" first. This will clear any saved javascript code. I understand that sometimes addresses of stuff change between builds so you can't guarantee that previously saved code will run. Wiping the board entirely with erase_flash usually sorts problems like this.