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I came across a possible fix that might be worth a try. I didn't come up with this, btw, so I can't promise it will work. Back up your iPhone through iTunes, then disconnect the phone and turn it off. Hold down home and use USB to connect to your computer and put it into recovery. Restore through iTunes, but don't go to your backup until after using the setup wizard. At this stage it should reestablish WiFi. If not.... Either way, then restore from iTunes, hopefully with functioning WiFi. Good luck!