First you need to download the iOS 5 IPSW files from the Apple servers. Click the link that corresponds to your iOS5 device - iPhone 3GS, iPhone 4 GSM, iPhone 4 CDMA, iPad (original), iPad 2 WiFi,wholesale oil painting, iPad 2 GSM, iPad 2 CDMA. Remember that IPSW files are 700+ MB in size so you should probably use a download manager that can resume broken downloads.

Now plug-in your iOS device to the computer using the USB cable, launch iTunes and click Update to upgrade your device to iOS 5. This time it will directly pick the local .ipsw files and the upgrade should happen without any issues.

Once the firmware file has downloaded,Pop art oil painting, close the iTunes software and also disconnect your iPhone / iPad  from the computer. Next copy and paste the IPSW file to the following location:

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On Windows:
%APPDATA%\Apple Computer\iTunes\iPod Software Updates

If you have been trying to upgrade your iPad,Abstract oil painting, iPhone or iPod Touch to the all-new iOS 5 but getting unknown errors with codes that read like 3200 or 3002, here’s one possible solution.

I have used the same technique to update my iPad 1 and iPad 2 with iOS 5 and the software installed without any problems.

You can also upgrade the iOS firmware manually by holding down Shift while pressing the Update but for some reason, this approach always resulted in same 3200 and 3002 errors.

On Mac:
~/Library/iTunes/iPone Software Updates