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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.

I just received my puck.js. It connected to the IDE which informed me that an upgrade from 2.10 to 2.12 was available so I tried to install it.

What happened was:

1. I took out the battery, pressed the button, plugged the battery in, then released the button
   
2. The LED went green
   
3. I started the Flasher and paired it
   
4. The LED went blue and then the progress bar slowly marched to completion
   
5. The LED went red. I waited a minute and a half and then reset the puck.js
   
6. After a reset, the LED went red again. The puck.js doesn't show up in Bluetooth devices when I start the IDE, but I can repeat the upgrade attempt and get back to the red LED.
   
   

Any ideas on what to try next??

Interested in JS on microcontrollers