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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
You've definitely got the 'original' F407 discovery board, and not the F401? Have you tried a different USB cable?
Maybe it's just that you need the drivers for it? But this is why we have the Espruino board - when there's one bit of hardware it's significantly easier to support it :)