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update 4.2.1 jailbroken iphone 4 to 4.3

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Member Since: Dec 05, 2009
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I want to update to the ios 4.3 system and loose the jailbreak feature. How do I do this correctly. I read a lot about preserving baseband but can I just hit update and be ok?
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I used these instructions to do just what you're describing. How to Undo a Jailbreak | Mac|Life

MacBook Pro 13", 8gb RAM, 750gb HD.
IPad 2, 16gb, Wifi - 3G.
iPhone 4, 16gb
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Member Since: Nov 06, 2006
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Mac Specs: 2006 Macbook Pro 15.4" glossy screen, 2.16 ghz, 640 gb, 2 gb ram

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As the owner of a jailbroken phone have always been under the impression that simply restoring the phone and updating to the latest firmware undoes the jailbreak.

However, sometimes parts of the jailbreak remain. I had a jailbroken 3G and one of the apps I had on it was "Make it Mine" which allowed me to change the "AT&T" label next to the signal strength to my name (or anything else I wanted it to say). When the phone started giving me trouble I decided to restore it. After restoring the jailbreak was gone, but the carrier name was still, "Paul."

For some reason that little piece was not erased in the restoration.
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