Restore
Make sure all your info and media is backed up in iTunes and Outlook (Contact & Calendar) or iCal and Contacts for a MAC first.
Restore you iPhone. When it asks, check "Set up as new phone". NOT from a backup. Uncheck that you want to sync contacts and music or whatever in the next screen. If it tries to sync just stop it.
You will have a fresh iPhone that is empty. Proceed with the Jailbreak.
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