HT4623 i am using i phone carries 4.1 (8B117) version how can i update and install newer versions

I am using I phone 4 it carries 4.1 (8B117) version how can i update and install newer softeares

Important you follow the directions here:
http://support.apple.com/kb/HT4972
The update to iOS 5.0 or higher is an erase/restore deal, so its important that all of your data be on your computer before you attempt to update.
iOS 6.1.3 will be installed on your phone.

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