Downloaded ios 8 on iphone 4s and wifi is not working, any ideas on how to rectify the situation?

Please help.  Downloaded ios 8 on the iphone 4s and the wifi button is GREYED.  Tried to resetting the Phone without losing data and losing data but wiyhout success.  Does anybody know how get the wifi working again, please as I have a very disgruntled daughter.  I believe it could be down to a battery issue, over heating? Is there a solution?
Thank You for reading and a response to sort it would be much appreciated.

What was the full wording of the error message? Usually there is also a number or additional information.
Try placing the iPod in Recovery Mode and then restore
Next try DFU mode and restore.
How to put iPod touch / iPhone into DFU mode « Karthik's scribblings

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