1.0.2 to 1.1.1

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Sep 30, 2007
How would I upgrade an iPhone that is running 1.0.2 firmware and is jailbroke and has a bunch of third party stuff on it to 1.1.1 without getting rid of the applications? And also from 1.1.1 to 1.1.2.
Thank you for anyone that helps me out!