How update iOS 4.2 to iOS 5.0?

How update iOS 4.3.5 to iOS 5.0?

If your iDevice is using a version of iOS lower than 5, you will need to use iTunes on your syncing computer to perform the upgrade. Use the Apple link below as a guide for the upgrade.
http://support.apple.com/kb/HT4972
Also read the instructions from the section entitled "Update your device using iTunes" at the link below.
http://support.apple.com/kb/HT4623
Information regarding transferring purchases from your iDevice to iTunes on your syncing computer can be found at the link below.
http://support.apple.com/kb/ht1848
This procedure will upgrade the iPad to 6.1.3.

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