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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
It looks like right at the end of the video you managed to hold the button down long enough that it booted without loading code and then should have been connectable just fine with the IDE - maybe check that no other device is trying to connect to it at the same time, and maybe even look at rebooting your PC in case it's got confused by Bluetooth changing.
You could also use the bootloader itself to update the Bangle.js firmware to a cutting edge version (http://www.espruino.com/Firmware+Update#nrf52) in the newest versions there's now a recovery menu if you long-press the button all through the boot, and that can allow you to do a factory reset