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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.
@Gordon
Some chips have a 'write protect' to stop accidental writed - for instance even the STM32 in Espruino requires a series of values to be written in the correct order to 'unlock' it. Could that be the problem?