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@Gordon
Hi,
The red flash when the battery is inserted seems like a good sign...
You need to hold the button down while you insert the battery. Pressing the button after the battery is inserted will have no effect.
Could that be the problem?
The Pucks should be recognized out the box once the red LED has flashed. Do you have an Android phone/tablet or some other computer you could try? It's possible that there is some configuration issue on the PC you are using.
If there are still issues, please could you record a video or how you do the reset and also what happens on the PC when you go to connect?