After upgrade ios to 5.1...could't connect wifi...????

Help!!!....anybody can solve this problem...

Did you try rebooting your router? Unplug it for about 30 seconds and then plug it in again.
Did you try restarting the iPad? Restart the iPad by holding down on the sleep button until the red slider appears and then slide to shut off. To power up hold the sleep button until the Apple logo appears and let go of the button.
Sometimes it helps to look over the basics again.
Apple - Support - Wi-Fi Assistant - iPad
If that doesn't work - there is more information here that may help.
iOS: Troubleshooting Wi-Fi networks and connections

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