Are you sure you held down the BOOT0 button as you plugged the board in?
Just a quick plug, but this is why we make the Espruino Board. The other boards tend to be harder to get started with.
@Gordon started
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.
Are you sure you held down the BOOT0 button as you plugged the board in?
Just a quick plug, but this is why we make the Espruino Board. The other boards tend to be harder to get started with.