I've iPhone 4s, and I am trying to update it to iOS 5.1 I've downloaded the software from iTunes, but when I click to install it, it says: "There was a problem downloading the software for the iPhone 'Donnbjj1's IPhone'. An unknown error occurred (1480)"

I have an Iphone 4s 32gb and i'm trying to update it to ios 5.1. i've downloaded the software from itunes but when i click on it to install it to my actual phone it says: "There was a problem downloading the software for Iphone 'Donnbjj1's Iphone' . An unknown error occurred (1480)."

iOS: Resolving update and restore alert messages
For error -50: See error 13 and 14: 
Error 13 and 14: These errors are typically resolved by performing one or more of the steps listed below:
Perform USB isolation troubleshooting, including trying a different USB port directly on the computer. See the advanced steps below for USB troubleshooting.
Put a USB 2.0 hub between the device and the computer.
Try a different USB 30-pin dock-connector cable.
Eliminate third-party security software conflicts.
There may be third-party software installed that modifies your default packet size in Windows by inserting one or more TcpWindowSize entries into your registry. Your default packet size being set incorrectly can cause this error. Contact the manufacturer of the software that installed the packet-size modification for assistance. Or, follow this article by Microsoft: How to reset Internet Protocol (TCP/IP) to reset the packet size back to the default for Windows.
Connect your computer directly to your Internet source, bypassing any routers, hubs, or switches. You may need to restart your computer and modem to get online.
Try to restore from another known-good computer and network.

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