How to update my iphone to 6.0.1?

So this phone is my aunts old iphone and the version is 4.3.5 and if i update it i'm afraid to delete all of her pictures. She has like 2, 000 pictures not kidding at all. My computer won't let me put all of them onto the computer for some reason and i need help because i want to update and i'm afraid i will delete it all

Just connect your phone to your computer.
Open iTunes.
On the left side it will say "Your Name's iPhone".
Click that.
And click update software version.

It depends what phone but the pictures probably won't delete, when I updated my IPhone to the iOS and again to the iOS 6 everything saved, all the apps contacts and pictures. Just update it.

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