I updated my iphone 4s to the latest ios ( 6.1.3 ) and afte the update i found the wifi is grayed .. any help is really appreciated

i updated my iphone 4s to the latest ios ( 6.1.3 ) and afte the update i found the wifi is grayed .. any help is really appreciated

This is most often a severe hardware fault of the WiFi Chip. But steps to try are, Settings App > General > Reset > Reset Network Settings. See if fixed. If not, Restore iPhone with iTunes on your computer. See if fixed. If not, and if there is Warranty or AppleCare make Genius reservation or set up service and take or send to Apple for resolution.

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