I jailbroke my phone without knowing the risk but now i want to undo it how can i do it im on 4.2.1 please help

I jailbroke my iphone 4 with out knowing the risks im on 4.2.1 can  i unjailbreak it if i take it back to the apple store or any other sugestions????

Just follow the steps in:
http://support.apple.com/kb/ts1275
It is all about update and restore alert messages.

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