HT201269 I used Version : 4.2.1 (8C148)  but I want to update New version because some application need 4.3  ....  please tell me about to  update new version for my iPhonoue 4. Thank you.

I used Version : 4.2.1 (8C148)  but I want to update New version because some application need 4.3 or 5 ....  please tell me about to  update new version for my iPhonoue 4. Thank you.

Start iTunes on the computer you normally sync with. Connect your phone. Select your phone in iTunes on your computer and select the General tab in iTunes. Then scroll down to check for updates. iTunes will update your phone to the latest version of the iOS that is availablele.

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