Why my iPhone 4 hasn't software update option? How I can update my iPhone?

Why my iPhone 4 hasn't software update option? How I can update my iPhone?

You have to use iTunes.

You don't need iTunes. Go to Settings->General->Software Update.

Probably your current iPhone software version is bellow 5.0
Connect to iTunes, update and after that you will have "update option"

Open iTunes, download iOS 6 from here: http://www.idownloadblog.com/iphone-downloads/
Then hold down Shift and hit restore. Locate where you downloaded iOS 6/6.0.1 and select the iOS 6.ipsw file. Then press open and let iTunes update your iPhone

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