How to get iOS 7 without losing jailbreak?

I have an iPhone 4 with AT&T coverage and it has the jailbreak 6.1.2 and I have a Mac computer but I don't want to restore my iPhone or loss any of my stuff that I have on it

If you want to keep the jailbreak then you should not update to iOS 7. There's no way to keep jailbreak and get the new iOS on the same device

Http://www.youtube.com/user/iOS7JB