If you've been paying attention to the news today, you're probably aware of the unexpected release of iOS 4.3.5, an update that allegedly fixes a security issue with certificate validation. If you've backed up a blob from an older version, fear not, you can downgrade very easily.
Apple has just released iOS 4.3.4 which patches the PDF vulnerability exposed by Comex’s JailbreakMe 3.0 tool which was used to jailbreak iPhone, iPad (and iPad 2) or iPod touch on iOS 4.3.3.
iOS 4.3.3 has been released today by Apple for iPhone 4, 3GS, iPad, iPod touch 4G/3G to fix the much talked about location tracking bug found on devices running iOS 4.x.
Apple today has released iOS 4.3.1 for iPhone 4, 3GS, iPad 2, iPad, and iPod touch 4G/3G. If you upgraded to iOS 4.3.1, and now you want to downgrade back to iOS 4.3, iOS 4.2.1 or 4.1, simply follow the instructions posted below to downgrade iOS 4.3.1 on iPhone 4, 3GS, iPod touch, iPad 2 and iPad 1 to iOS 4.3, iOS 4.2.1, 4.1, 4.0.x.
iOS 4.2.1 was released yesterday for iPhone 4, 3GS, 3G, iPod touch 4G, 3G, 2G and iPad. Even though iOS 4.2.1 jailbreak is possible via Redsn0w 0.9.6b2, but Cydia is still broken which makes the jailbreak pointless for many. It also contains new baseband for all iOS devices which currently makes it impossible to unlock using existing version of Ultrasn0w. So if you upgraded to iOS 4.2.1 and now want to downgrade back to iOS 4.1 / 4.0.2 / 4.0.1, follow the instructions posted below to downgrade iOS 4.2 on iPhone 4, 3GS, 3G, iPod touch and iPad to iOS 4.1 / 4.0.x.
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.
Ok guys let me clear this upfront. I haven't tested this method yet, but by the looks of it, there is no reason why it shouldn’t work. If you have just got a new iPhone 4 or iPhone 3GS (new bootrom) which is on iOS 4.0.2, you can now downgrade to iOS 4.0.1 without having your SHSH blobs saved. This will of course allow you to jailbreak and unlock your new iPhone with JailbreakMe, and patch it with PDF Patch so that you are safe from PDF vulnerability in iOS 4.0.1.
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