can’t! Even if you have the SHSH blobs saved, you’ll get stuck in a recovery mode loop. This is an issue when you upgrade to 4.3 and want to go back down, as you…. In iOS 4.1 and earlier, you could simply use TinyUmbrella to kick it out of recovery mode, but Apple have stopped this in 4.2.1. If the baseband doesn’t match the baseband in the firmware you just restored to, it’ll simply error out (usually with an error like 1015) and you’ll be stuck with an unbootable device, stuck in a recovery loop. From iOS 4.2.1 however, a check is performed at first boot after restoring to the firmware version to check the baseband version. Usually, this is pretty easy to bypass using a tool such as TinyUmbrella. Unfortunately, as of iOS 4.2.1, Apple is making things somewhat trickier.įor 3G devices, when you update or restore to a new version of iOS, the baseband is also upgraded. Usually it’s pretty easy to downgrade if you’ve got the SHSH blob for your device for the firmware you’re trying to downgrade to. Presumably in an attempt to prevent jailbreaking, to enforce security and to make sure everyone has the latest version. This means that usually once Apple releases an update, you can’t go back down, you’re forced to go up. If you’re like me and enjoy tinkering and playing with the latest iOS betas simply for the ‘fun of it’, chances are you’re pretty ‘cluey’ about iOS and how the iPad, iPhone and so on work.Īs of the iPhone 3GS and iOS 3.x, Apple now signs every single firmware with a signature, unique to every single device and firmware called a ‘ SHSH blob’.
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