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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
It's a bit of a guess, but I had one of those Broadcom ones in my Laptop (albeit with a very slightly different USB ID) and got it working before by doing this.
Basically they they've just got a list of USB adaptors that they know it works with - and yours wasn't in that list even though it will probably be fine.