yes it is possible, just google it, Iphone firmware 1.1.2 download or something like that.
But read the tutorial somewhere before on how to upgrade.
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Dudes im been monitoring this issue regarding the upgrade on Iphone..
me got a Question i got a unlocked iphone V. 1.0.2 i want to upgrade it into V. 1.1.2 it is possible to upgrade it? where can get the upgrade??