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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.
@user135646
Flashing via DFU didn't work (the file sent over ok on the app, but nothing happened).
Programming via the J-link on the nRF DK board didn't work either (which was odd).
But I found a J-Link Ultra+, and that programmed it just fine. The radio demo seems to be working - thank you for the help.
The current board doesn't have a programming header per-se, so one unit will be kept as the 'radio test unit'. No need for the Espruino .hex, but thanks for offering.