IPhone 4 8gb problem! No more space?

Okay, so I have the iPhone 4 and I was so excited to update to iOS 7.It says I need 3.7 gb to update. I deleted everything up like 20 photos that take up 174 mb. I need.4 more gb to update. But, there's nothing left to delete! It says I have 3 gb being used but there I nothing to be deleted. I have the iPhone 4 8gb btw. Please someone help me!

Delete apps, cookies in Safari browser, messages, history, or just factory reset your phone.

A lot of the space is taken by updates and ***.

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