TS1559 The wi-fi in my iphone 4S is 'greyed out' and i am not able to switch it on. I have tried resetting the network settings but nothing happened. I can't even download the new iOS7 version as it requires WI-FI to do so. Please help.

The wi-fi in my iphone 4S is 'greyed out' and i am not able to switch it on. I have tried resetting the network settings but nothing happened. I can't even download the new iOS7 version as it requires WI-FI to do so. Please help.

I had same problem. I removed the back cover, and warmed wi-fi module by hairdryer of my wife). five days wi-fi works great. I do not know what will happen next.
during operation iphone must be turned off. time of heating is near five minutes. wifi module is located upper the battery, on the upper right corner of device.

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