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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.
@NorthVanMarty
The Puck version is 2.1a.
I was using the IDE from Chrome on a Mac as the source - that's where I had the trouble. I had tried flashing it twice.
Using nRF Toolbox on iOS I was able to reflash it. Now the Puck is visible in the IDE again and I'm off to experimenting.
Thanks.