To be honest it should work without any problems on your iPhone 3GS (even without reboots).
Do you, by any chance, have any Cydia Software installed?
Additionally, what are your exact device information:
iPhone 3GS with ? GB (and how much is free on your disc)?
What is your iOS version number?
Last edited by Sebastian Palkowski; 05-25-2011 at 09:20 AM.
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