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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
Correct. However the UART bootloader is a piece of software that comes installed only on the STM32.
Yes, you can. If you have any questions about how to do it, I'd ask Raytac directly since it's their module.