I have an iphone 4S and stupidly let it update to iOs 7 and now I cant get wifi or bluetooth. Anyone know how I can get back the previous update when my iphone was working perfectly?

I have an iphone 4S and stupidly let it update to iOs 7 and now I cant get wifi or bluetooth. Anyone know how I can get back the previous update when my iphone was working perfectly?

Your WiFi/Bluetooth chip has failed.  Bring the phone (and $199 if outside the warranty period) to Apple for replaceement.

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