HT3743 I bought a jailbreaked iPhone 3G and would like to un-jailbreak it. Can I?

I am sure that the jailbreaking is partly responsible for slow reactivitiy of the phone, and as I am not very technical, I would simply like to put it back like it was and use iTunes normally.
What do I do?

Can be risky. Depending on how your phone was jailbroken, you may NEVER be able to install a stock iOS back on the phone, and any attempt to do so could render your phone a brick. Apple warns about this. If that happens, you won't get any support here or from Apple, you'll have to use Google.
Good luck.

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