How to download IOS 8.0 or up in my iphone 4 8 gb. It's not showing in updates section?

I have iphone 4-8 gb with about 5.3 gb free in it. At the moment, it has 7.1.2 IOS. When I update it, it says your 7.1.2 IOS is updated. But I want to change it to IOS 8.0
Please let me know I can do it.

Some phones are too old to update. If you need IOS 8, you will need to get a new iphone. I believe iphone 4s runs it, but i would do research first.

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