Can I just update my ipod touch to restore & un-jailbreak it?

lil hunter

New member
Right now my ipod touch is jailbroken. I would rather have the new apple update than have it jailbroken for various reasons. So I want to know if I can just update it, or if I have to restore my itouch then update it. HELP!
I have an ipod touch 2nd generation.
With firmware 3.1.3
 
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