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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
You could ask RAK Wireless whether they have included a bootloader on their devices from the factory, but I don't think so - in which case I'm afraid you're out of luck.
It is possible to use OpenOCD from a Raspberry Pi to program nRF52 though - I'm afraid I don't have the link handy but I believe it was Adafruit that had something