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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.
@andrewg_oz
Actually, I think I can answer my own question. I had been following the instructions on the page:
https://github.com/espruino/Espruino/blob/master/NRF_Bootloader.md
They are now outdated, but I ended up doing:
make clean;BOARD=BANGLEJS2 RELEASE=1 BOOTLOADER=1 makeand
make clean;BOARD=BANGLEJS2 RELEASE=1 makeThen loaded the bootloader.hex file first, followed by the application.hex. Then power-down overnight and here I am...