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Discuss Upgrading to 4.2.1 issues at the iOS 4.x (iPhone OS 4.x) - Hackint0sh.org; I'm trying to upgrade to 4.2.1 on my iphone but i keep getting 1603 errors ...
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    Default Upgrading to 4.2.1 issues

    I'm trying to upgrade to 4.2.1 on my iphone but i keep getting 1603 errors and the phone just sticks on the upgrading progress screen. I have the latest version of itunes. I am upgrading from from a jailbroken 4.1 if that makes any difference. Any help would be greatly appreciated.



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    Super Moderator Array Olethros's Avatar

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    Are you "restoring" or "upgrading"
    Are you trying to preserve baseband via TinyUmbrella or other techniques that modify the hosts file to redirect gs.apple.com?

    This error is normal on an iPhone 4 when you redirect gs.apple.com to prevent baseband update.
    Last edited by Olethros; 02-11-2011 at 09:56 PM.
    Please read the stickies & search forum before posting!
    How to report an iTunes restore/update fail in a useful manner
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