Not enough space on my iPhone 4 for iOS 7

I have a 8 GB iPhone 4 and I wanted to download iOS 7 but I didn't have enough space so I deleted all my music all my texts all my apps and all my pictures and all my emails but I still don't have enough room it says what can I do to get more room!

Connect your phone to a computer and open it as a drive, not through itunes.

Ensure that nothing has been put onto the root of the phone. An iPhone can be used as a portable hard drive as well as a phone. When you drag and drop something (say pictures) onto the phone, it goes onto the root and not into the proper file to be viewed.

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