HT5278 I have an iPhone 4, and I go to Settings, General, Software Update, and it says iOS 5.1.1 and I tap on the Install Now, and Agree, then i get the verifying update, and then it says "unable to install update, an error occured installing iOS 5.1.1

I have an iPhone 4, and I go to Settings, General, Software Update, and it says iOS 5.1.1 and I tap on the Install Now, and Agree, then i get the verifying update, and then it says "unable to install update, an error occured installing iOS 5.1.1

I have exactly the same problem.  iPhone 4S, never been jailbroken.  Not behind a firewall and it happens whether I am on my home compute (iTunes) or directly thru Settings_Update.
Looks like loads of people are having the same problem - and as far as I can see, Apple's sole reply is jailbreak or behind firewall/ security settings/anti-virus.  None of those apply here!

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