Explaining iOS 6 and the SHSH Myth
I have noticed lately a lot of questions about SHSH‘s and the possibility to downgrade from iOS 6.1.x versions to lower versions of iOS 6 or even iOS 5, and while a few months ago we reported details of changes made by Apple, I will speak again about it. For starters I can say that SHSH’s are unnecessary since iOS 6 if you have a terminal launched after the iPhone 4, meaning iPad 2, iPad 3, iPhone 4S, iPhone 5, iPad Mini, iPad 4, iPod Touch 5G. In none of these terminals you may not get downgrade from iOS 6.1.x to iOS 6.x or lower versions, except iPad 2 which allows it only if you have saved SHSH for iOS 5.x and iOS 4.x.
Unfortunately Dev Team haven’t discovered yet a method to make SHSH useful on these terminals and at the moment seems unlikely the discovery of any ways to make them usable. Apple started blocking signing the old versions of iOS on the same evening to launch a new version, signing the iOS 6.1 SHSH’s at just an hour after iOS 6.1.2 release. If in the past Apple didn’t do this for a few days now acts fast and force users to install only the latest version of the iOS.
Unfortunately SHSH’s, or blob saved with redsn0w prove to be useless for those who do not own an iPhone 3GS or iPhone 4 and do not try to downgrade via iTunes or redsn0w other new devices, because you will not succeed and they may be forced to do the restore. In conclusion, SHSH’s are useless if you own a iOS 6.x device released after the iPhone 4.