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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
@sebi ok, then you have the bootloader indeed, bad guess. If you would mass erase it (unlock flash protection like you said) and then flash just softdevice and the app it would behave like this as bootloader is optional and reboot would just restart espruino. but that would give you all FFs with that peek command.