Save iOS 4.1 SHSH Blobs Now to Ensure an Untethered iOS 4.2 Jailbreak
Apple has already seeded the final Gold Master version of iOS 4.2 to developers. Public release is looming near. Once the new firmware is out, Apple will stop signing the old firmware, which will make it impossible for you to get SHSH blobs for iOS 4.1.
Why should I save my SHSH Blobs for iOS 4.1? There are two reasons for it. a) If you accidently upgrade to iOS 4.2, and want to downgrade back to iOS 4.1, you will need your SHSH blobs saved on Cydia. b) The next update to Limera1n basediOS 4.2 jailbreak tool will require SHSH blobs for iOS 4.1 for an untethered jailbreak. If you don’t save your SHSH blobs now, you will get tethered jailbreak on iOS 4.2, NOT untethered.
While Cydia can save your SHSH blobs automatically, it is best to use TinyUmbrella to ensure that you have SHSH blobs on file. Better to be safe than sorry!
Here’s how you can save your SHSH blobs for iPhone 4, 3GS, iPod touch 4G / 3G on iOS 4.1 and iPad on iOS 3.2.2.