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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.
@user106712
I have made sure that other bluetooth devices are no connected to it.
I've reflashed the Puck with v2.05 using nRFTool. I also powered up while holding the button (until beyond the 5 red blinks).
On the desktop, I reset its bluetooth module so that it has no memories of prior pairings (I had to re-pair my keyboard and mousepad).
In this fresh start, the other Puck appears quickly in web IDE and is re-paired.
The web IDE still cannot seem to find this Puck during 're-scan'.