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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
Did you update the firmware on the Nucleo itself? ST decided to add extra checks to their bootloader which makes it refuse to upload perfectly working code.
I was hoping they'd revert them, but presumably they haven't.
Bug here: https://github.com/espruino/Espruino/issues/742