Soon after the release of iOS 6.0 to the public, the iPhone Dev-Team has updated their blog with some useful information. The iPhone Dev-Team says the 5.1.1 SHSH blob signing window will soon close, so it’s very important that you backup your 5.1.1 blobs now while you still can.

Redsn0w that was released a month back lets you downgrade A5+ devices from 5.1.1 to anything lower (if you had saved blobs). Unfortunately once the 5.1.1 window closes, Redsn0w’s 5.x downgrade feature will no longer work. Most A5+ users will not be able to downgrade. So if you’re an A5+ owner up at 6.0 when the 5.1.1 window closes, you’ll be stuck there without a jailbreak for now.

iPhone Dev-Team says – “We’re happy to report there are some serious deficiencies in the 5.x restore process that are permanently exploitable. They’ll never be fixable by Apple because they’re all self-contained in the 5.x IPSWs. Here’s the breakdown:

• A4 devices and 3GS will always be downgradable and jailbreakable with saved blobs due to Limera1n. The tethered iOS 6 jailbreak for those devices (and untethered for old-bootrom 3GS) will be out when Cydia and other important pieces are all working properly.
• iPad 2 owners who have both 4.x blobs and 5.x blobs will always be able to downgrade to those versions, even once you come up to iOS 6.0 and the 5.1.1 window closes. You need both 4.x and 5.x blobs to qualify for the 5.x downgrade even though you only wish to downgrade to 5.x (you need only your 4.x blobs to downgrade to 4.x)
• iPad 3, iPhone 4S (and iPad 2 owners who don’t satisfy #2) will always be able to RE-restore the current 5.x OS that’s already on their device. So if you’re at 5.1.1 when the window closes (and you’ve saved your blobs), you’ll always be able to RE-restore to 5.1.1 again. This makes the 5.1.1 jailbreak a lot less fragile — you don’t have to worry about messing up your install with funky extensions or getting into a boot loop, because you can always RE-restore from 5.1.1 to 5.1.1 again (or from 5.0.1 to 5.0.1 again, etc). But once you fall off the 5.x train by restoring to 6.x, you’ll be stuck there until the next jailbreak.