My iphone 4s won't upgrade to ios8

Before you go telling me how to check for updates, via wireless and iTunes, I've already tried it. About a hundred times. Both my phone and my computer say that I have the most curent/latest version, which is the ios7.1.2. I don't know what the problem is. There are no error messages, I have plenty of space on my phone, I really need help.

Don't Upgrade… IOS 7.1.2 is the fastest and most stable operating system for the IPhone 4S

Don't Upgrade

Too many apps will not work not on anything less than IOS 8

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