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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
The ST VCP drivers, which is sounds like you have done.
That's odd, because usually it should come up and at the very least tell you it doesn't have drivers. My guess is that your board has a different layout to the one that I built Espruino for, and that the USB disconnect transistor isn't connected to the pin that Espruino expects.