IPhone 4 Carrier Settings Update

It bassically says:
Carrier Settings Update
New settings are available for your
iPhone. Would you like to update
them now?
Two options: NOT NOW or UPDATE

This happened to Unknown person that unlocked his IPhone 4 legally.
If he clicks update the legal unlock will not work and the IPhone will go back to At&t. This is claimed to fix the IPhone 4 Deathgrip.

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