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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
Default serial console is 9600 baud. PA13-15 are SWD/JTAG pins at power-up - so they'd half-glow if Espruino hasn't even got to the point of initialising.
What about RST pull-up, and BOOT0/BOOT1