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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
The boot looping could just be a failed firmware update? Maybe see if you can hold the button to get it into the bootloader mode, and then update via the DFU Android/iOS app (not the App Loader).
Info at https://www.espruino.com/Firmware+Update#nrf52
But if you're still having trouble, maybe take a video and post it up so we can see?