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I just recently bought an iphone4. It came installed with 4.2.1 firmware, and since 4.3.4 is released now it is not as simple as to just update the firmware with itunes. I have tried some good which tells you to use tinyumbrella, but I didn't got it to work. As I got error message 1604 when trying to restore. Anyone know how to upgrade to 4.3.3 firmware?

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When you connect to iTunes, and ask iTunes to get the latest firmware for this device, what happens? I'm assuming a non-jailbroken iPhone, of course. – GEdgar Jul 25 '11 at 18:22
it will ask if I want to update to the latest version of firmware. But I want to update to 4.3.3, thus I need to use tinyumbrella for it. – starcorn Jul 27 '11 at 14:42

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