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By mistake I updated my jailbroken iPhone to iOS 6.0 from iTunes.

How do I get the iPhone working again like it was before? It suddenly asks for activation.

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Do you have a backup from the old version, maybe? – slhck Jan 4 '13 at 9:37
no i have not backup from the old version – jani almani Jan 4 '13 at 9:40
@slhck no i do not have backup of the old version any idea how to install now iOS working perfectly on my iphone – jani almani Jan 4 '13 at 9:43
If you don't have a backup there's not really a way to go back easily. See: iOS 6 Jailbreak: How To Downgrade iOS 6.0.1 To iOS 5.1.1 Using Redsn0w On A4 Devices – slhck Jan 4 '13 at 9:45
Backups mean nothing. You need SHSH blobs in order to downgrade. Backups contain no part of the actual iOS firmware. – Andrew Larsson Jan 10 '13 at 16:25

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