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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.
@fanoush
it still runs your code after flashing, you need firmware that has storage in some other location so your js code is not run at boot, strange that it does not skip it when holding button, you mentioned .boot0? you really saved it as .boot0? that would explain it :-)