You can't restore to 5.0.1 without stitching SHSH blobs, you must restore to 5.1.1
Is it currently on 05.13.04 BB, and when trying to update to 5.1.1, it fails? It shouldn't have a problem updating using stock IPSW after the baseband downgrade.
Did you get the ATT carrier unlock or do you need to jailbreak again to unlock using 05.13.04?





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