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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.
@DrAzzy
BTN1 is B12, as I understand it.
Right next to C11, there's a hole on the Espruino where a pin could be installed, and "RST" is silkscreened next to it. I'd wager that that's the reset pin.