I stumbled on that thread after fighting with the pairing of a contact sensor whose battery had died.
I first thought that was my Orbi router and its “merged” 2.4Ghz/5Ghz SSID that was messing with me but then, after disabling the 5Ghz network, I was able to pair a brand new sensor coming straight out of the box.
The older one with a new battery would flash rapidly more than 3 times and never pass the pairing process. And 2 more sensors with low batteries behave the same. I’m afraid those are bricked 
I will leave them alone a few days see if that unbrick them…
I had a few more new sensors laying around so I replaced them in the meantime.
I won’t be returning the defective ones as I had them imported to France through my brother and the shipping costs would not be reasonable compared to the price of the items.
Disappointed by Wyze on missing such an issue.
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