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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
That all looks fine - did you flash the zip that's created with the steps from http://www.espruino.com/Puck.js#firmware-updates ?
Specifically the very last step with the button that clears out any saved JS.
You mentioned
nrftool- did you connect directly to the board via SWD? If so you'll need to build withoutDFU_UPDATE_BUILD=1and flash the resulting hex (as that'll include the bootloader)