Jailbreak 5.1.1 to iOS 7

I have an iPhone 4s running on an jailbreaked iOS 5.1.1. I want to update to iOS 7 but I have read stuff like people getting errors etc. What should I do? I wanna be able to update to iOS 7 without losing stuff like my contacts etc.(i'm aware that all my jailbreak stuff will disappear.)

If you want to install iOS 7, get a backup from iTunes, click 'Restore', and after restoring device, restore the backup. But if you do this, you will lose all your jailbreak stuff and your device will be 'Non-Jailbroken'.
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