IPhone 4 stuck on iOS 6.2.3?

I think it is 6.something.3.
I had the option to update to 7 earlier, but every time I tried showed an error.
I tried turning my phone on and off, and the internet on and off, still doesn't work.
No answers without a solution please.

First it is on 6.1.3
Second, many people are having trouble downloading the update. Wait a day or two a and it should work

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