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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.
@Kim
Have fun with your Espruino :). When you hold down BTN1 and then press RST you indeed see the blue and red LED. Don't release BTN1 at this point. Only release RST. This should make the blue LED start glow while the red LED turns off. You can then release BTN1.
To exit this bootloader mode just briefly hit the RST button.