I have tried three different routers at different locations; I have turned off encryption altogether on one network to see if I can get the Nook to connect (turned back on afterwards when there was no difference.) I renamed a network in case there was some weird caching of settings. No go at all.
However, I was able to connect to the store network at B&N today and at least log in to authorize the Nook after a hard reset, so I can now get to my existing content again. Given that nothing whatsoever changed in my system configuration but the network connectivity started to fail immediately after the firmware upgrade, I think there's a bug that has bitten me. Sounds as if the store staff was more than willing to exchange my Nook for me, since it still has 9-1/2 months of warranty left. I may take them up on it.
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