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I have tried to update the iTunes but at the end of the procedures I received the following message :
"The iphone couldn't be updated because the firmware file in not compatible".
What does that mean, and how do I resolve this problem?
Weird. things like this happen to me all the time saying my phone cannot be synced with this computer, I wait a day or two and it works again.
Often it means you're using some non-current software.
The most obvious thing to check is: Are you running the current version of iTunes (10.6.3)? You can check for updates from the iTunes Menu under iTunes > Check for Updates.
ASOH, your message says you're running iOS 4.3.3. The current iOS for your iPhone 4 is 5.1.1. iOS 5 came out last fall.

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