Here are the official download links to iOS 5.1 directly from Apple:
How can I upgrade iOS5.1 which was downloaded from Apple directly?
I have hooked my ipad 2 into PC.
When I click the downloaded file the iTunes wake up but nothing happened.
What is next procedure?
Close the message that iTunes will notify you restore mode, check that you have correctly selected the iPhone on the iTunes sidebar under “devices”. Hold down Shift hours and keep clicking the Restore button (or, on OS X, Alt / Opt + Click on Restore). iTunes will pop up asking you to choose a file.
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