I am trying to upgrade my IOS from 3.1.0 to 4.2.1 without upgrading my Baseband . I have tried to make a custom restore with pwnagtool 4.1.3 and then installing with Itunes and I get a error . ant suggestions .
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3GS 3.1 to 4.2.1
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If you want real assistance it would prolly help your cause if you elaborated slightly - what error message are you getting?