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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.
@billsalt
I used nrfjprog from the Nordic Semiconductor toolset using the Nordic Development Kit JTAG output. The SWD (SoftWare Debugger) pins are on the center connector X1 (loaded on the Pro version). Adafruit schematic: https://learn.adafruit.com/assets/52793.