MY WIFI IS GREYED OUT AFTER MOST RECENT UPDATE TO IOS 8.3. I HAVE RESET MY ROUTER, MY NETWORK SETTING AND WIPED THE PHONE BACK TP FACTORTY SETTINGS. STILL NO LUCK. IT WAS WORKING PERFECTLY FINE PRIOR TO THE IOS UPDATE. THANKS.
Most likely there was hardware damage to a marginally functioning circuit component during updating, which is stressful to the phone. Get it evaluated by to
Apple. If you already restored to factory settings, there's nothing further you can do.