Apple ipod

How to restore all the settings for my iphone from a backup without restoring the firmware?

I jailbroke my iPhone 3G, which worked firmware 3.1 in the process I lost all photos, contacts, applications, etc, but they are all recorded in a backup file. However, I think that if I can restore The iPhone normally overwrite the firmware and will not be jailbroken. Is it possible that I can restore from backup without restoring the firmware? Is that logical? Thank you very much for any help.

Hi backup is not related to the operating system is used if you have iTunes 3.0 files and has just updated 3.1 Synchronization and all files are still there. Hope I understood that correctly. concerns.

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