Apple recently updated its iOS operating system to version 8.1.3. If you are among the lucky ones who didn’t upgrade, then DON’T! If you already have, and are trying to downgrade to 8.1.2 by also downgrading iTunes 12.1, then don’t even try. The signing window has passed.
Why downgrade iTunes 12.1?
The iOS Jailbreak community is pretty active. You have many tools that let you jailbreak an iOS device. A couple of them are listed below;
Basically, these tools exploit loopholes within the iOS operating system, allowing user applications to get access to the root file system, which can then be used to practically do anything with the iDevice. Apple obviously tries to patch up these loopholes with updates.
With each new update, Apple promises bug fixes, enhancements and performance improvements. But more often than not, it is only patching things up to run smoother, and cover up security loopholes left in the previous versions.
Apple recently released iOS version 8.1.3. The above mentioned tools (PP/TaiG) do not work with this version, because Apple has patched up the loopholes. In order to downgrade your device so as to retain the jailbreak, you need to downgrade iTunes 12.1 first, because iTunes 12.1 also prevents the exploit that makes jailbreaking possible.
What’s the problem?
With iOS 8.1.3 came iTunes version 12.1 (previously 12.0.1). We wrote a tutorial on downgrading iTunes 12.1, explaining that reverting back to iOS 8.1.2 requires reverting back to iTunes 12.0.1 first.
There’s a catch, however. Once upgraded, you can’t always go back to the previous version of iOS. Apple allows a limited time window during which you can downgrade – this is called the ‘signing window’. Once this is over, you can’t downgrade anymore.
The signing window for iOS 8.1.3 has elapsed as well, and now you can no longer downgrade to iOS 8.1.2. Since the main reason to downgrade iTunes 12.1 was to get back to iOS 8.1.2, it is now a moot point. You no longer need to go back to iTunes 12.0.1, since it won’t help anymore.
For now, you are stuck with no-jailbreak iOS 8.1.3. It is probably better to stick with the latest iTunes for now, and wait for the jailbreak community to find a new loophole for iOS 8.1.3 and later.
Good luck 🙂