Before the conference for the iPad 3 presentation, the Dev Team warns iDevice owners not to update to the latest version of the operating system dedicated to iDevices. The Dev Team claims that this week iOS 5.1 GM will be released for developers and the final version of the operating system will be released publicly next week and all those who have iDevices should not update if they want to jailbreak in the future! The biggest problem is for those who have iPhone 4S and iPad 2 because they will not be able to restore to iOS 5.0.1 after iOS 5.1 will be publicly released in iTunes, but the rest of the owners of iDevices will be able to downgrade/restore without problems.
- Soon after 5.1 appears on Apple's public servers (ie iTunes starts to offer it), Apple will stop signing 5.0.1 SHSH blobs.
- If you have one iPhone4S, the basic rule above is really the only rule: you cannot restore back to 5.0.1 once the 5.0.1 signing window is closed, no matter what (even if you saved your SHSH blobs).
- If you have one iPad2 with saved 4.x hashes, you can in fact downgrade to that 4.x but you won't be able to get to 5.0.1 once the 5.0.1 signing window is closed (even if you saved your 5.0.1 SHSH blobs ).
- If you have a device earlier than the iPad2, you can downgrade to whatever version you want, as long as you have saved SHSH blobs for that version. You'll need the assistance of geohot's limera1n exploit with tools like redsn0w to get into "pwned DFU mode" and bypass the downgrade restriction.
