If you're using an nRF52DK to program the board it should also appear as a flash drive called JLINK - just copy your hex files there and you're sorted, no need for nRFGo!
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.
Great! Thanks for letting us know!
If you're using an nRF52DK to program the board it should also appear as a flash drive called JLINK - just copy your hex files there and you're sorted, no need for nRFGo!