Can i upgrade
Yes, you can. The easiest way is to update the iOS system in the Settings app. Also you can resort to iTunes to do that. Follow the instruction below.
If you can't update iPhone iOS software wirelessly throug WiFi connection, you could give iTunes a try. As the all-inclusive iOS device manager center, iTunes provides multiple effective assistances for you, including: backing up iOS devices, restoring iOS devices, transferring iOS data files, and updating iOS devices. You could follow the below steps to learn how to update iPhone software with iTunes in detail:
For more methods, check: How to Update iPhone
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