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How to restore Jailbroken iphone 4 to it's default OS? I didn't take any backup before. I don''t to take backup any data.

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This is too broad - the lack of backup makes this a consulting gig, not a question that could reasonably be answered. If you split this up, be clear about what you need backed up, how you intend to back things up. Splitting the "can X be restored to Y" question might also get a reasonable answer - but all restores erase things, so perhaps sort out your backups first. – bmike♦ Jan 9 at 16:59

closed as not a real question by bmike♦ Jan 9 at 16:59

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As long as you have everything backed up, it is as simple as plugging it into iTunes, and factory restoring it. You now have an unjailbroken iOS 5.1.1.

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iKiel2012 - I have no backup – Metal Gear Jan 9 at 1:16
@MetalGear You might have better luck separating the two issues. 1) How to back up data - that's pretty complicated in some cases 2) If it's even possible to get Apple to sign 5.1.1 anymore. That's not likely as they're not signing 6.0 on devices that can go higher like the iPhone 4. – bmike♦ Jan 9 at 16:56
I don't want to back-up of data because data is not mine – Metal Gear Jan 9 at 17:33
Then it's as simple as restoring it. After restoring, you will have what looks like a brand new iPhone. – iKiel2012 Jan 9 at 20:52
You'd only be able to restore to iOS 6.0.1 anyways, unless you somehow have SHSH blobs, which is possible. – Andrew Larsson Jan 10 at 16:22

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