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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
Oops :) I'm tempted to add some code to it to explicitly stop it overwriting the bootloader... But then the original use of it was actually to allow bootloader upgrades so I'm not sure ;)
There's some info here: http://www.espruino.com/Serial+Bootloader
You just need a serial-ttl converter and 2 jumper wires (to connect BOOT0 to 1, and B2 to 0). It's not such a big deal as each binary on the Espruino site contains the bootloader.
By the way, the minified module does exist:
http://www.espruino.com/modules/STM32F1Flash.min.js
What problems were you having using it?