I want to downgrade iphone 4 ios 7 to ios 6 or 5?

Can someone tell me which version I can downgrade my iphone 4 ios 7 which I updated it
because after installing instagram I can't upload image to the instagram, I can only take photos or videos recording,

the icon of uploading images don't appear, that why I want to downgrade to lower version such 6

Unfortunately, you can't downgrade from iOS 7 to iOS 6. There was a brief ~1 week period immediately after the release of iOS 7 when Apple was still allowing users to restore their previous backed-up iOS 6, but they stopped allowing it.

Some claim to be able to downgrade, but I'd be very skeptical.

To read more, go to Apple's support community and search on "downgrade ios 7 to ios 6".

Unfortunately, you can't downgrade back to ios 6 once you've installed the ios 7 update… And that too on an iphone 4
Apple doesn't allow you to go back, your only way is to use the ios 7.

Can't.

As far as Instagram, try uninstalling & reinstalling the app to solve that issue. It works the same on an iPhone 4 as it does on the 5s both running iOS 7

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