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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's really strange. You wouldn't need a new softdevice as it's the same one for all versions of Espruino.
Just as a sanity check, could you try downloading it and re-flashing again? I just checked the zip files and the format seems almost identical, so it seems strange the upload would fail.
just to add: As you have an nRF52DK you could always upload the hex file - you just need one of the 10 pin small ribbon cables