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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 may have just plugged into the wrong USB port. There are two, and one of them goes straight to the device - which won't be programmed so won't work... you need the other one.
You'll only want to do that when you've successfully run
stm32loader- once you've done that you can use the Quick Start tutorial for the rest.Honestly, if you want something that 'just works' then buy one of the proper Espruino boards. The boards are a little extra, but that money all goes towards making sure that there's good documentation, support, and testing of the boards.