HT201210 trying to update my iPhone 4 to latest 5x ios and getting a "cannot update due to firmware not compatible

Trying to update iPhone 4 to the latest iOS 5, the error "cannot update due to incompatible firmware" prevents install. Any idea on where to find firmware update or resolve?

The correct way to upgrade the firmware is to first assure that you have the latest version of iTunes, then connect the phone to your computer. Click on the name of the phone in iTunes, then "Check for Updates" on the iPhone Summary screen. It should tell you there is a new version, and ask if you want to upgrade to it. If you are using any other method, or you downloaded a firmware file from a web site, you are asking for trouble.
The only thing you might want to do is to delete any .ipsw files on your computer before doing the above, in the unlikely event that the update file was corrupted during download.

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