Won't connect to wifi after update

I updated my Iphone 5 four days ago and now I cannot connect to WiFi at home.  My wife has the same phone, we bought them the same day 9 months ago.  She has not updated her phone and she gets great WiFi at our house.  What did the update do to my phone??  How do I get back on my WiFi??  I'm not updating my wife's phone until this is all fixed.

Hi, bsixK. 
Thank you for visiting Apple Support Communities. 
Sometimes a simple power cycle of the router can correct the issue that you are experiencing.  However, the issue could be a little more complex.  Wi-Fi routers need adjustments to settings periodically for optimized performance with the constant progression of wireless device technology.  As the issue has been isolated to your home and school network, I have included two articles.  The first article will cover basic Wi-Fi troubleshooting regarding iOS device connection.  The second article cover the recommended settings for current Wi-Fi access points.
iOS: Troubleshooting Wi-Fi networks and connections
http://support.apple.com/kb/ts1398
iOS and OS X: Recommended settings for Wi-Fi routers and access points
http://support.apple.com/kb/ht4199
Cheers,
Jason H.

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