Why the wifi doesn't work after the upgrade to iOS 5?

The problem is that after the upgrade to iOS 5 the wifi doesn't work. I mean, iPad is connected to the wifi but not to the internet and also the connection on the other device doesn't work. So I had to turn off the router and then turn it on.

Try a hard reset first to see if that does any good.  To do this, press and hold both the Sleep/Wake and Home buttons together long enough for the Apple logo to appear.
If no luck with that, you'll need to manually connect your iPod to your iTUnes library in recovery mode using the instructions in the Apple support document below. Doing so will allow you to bypass the passcode and restore the iPod.
iOS: Unable to update or restore
B-rock

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    ~~~~~~~~~~~~~~~
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