Cydia removed SHSH blobs from iOS 6.0 to 6.1.2 because they became unusable.
Hello friends, today we bring some unfortunate news for jailbreak and Cydia users. Saurik, the creator of Cydia, released a statement informing users what happened to the SHSH blobs for iOS 6.0, 6.0.1, 6.0.2, 6.1, 6.1.1, and 6.1.2 that Cydia stored. Apparently, the SHSH blobs are no longer available in Cydia due to a problem that rendered them useless, meaning they won't work for downgrading (reverting to a previous version).
This is very unfortunate news, as users with A4 devices will not be able to revert to iOS 6.0 or 6.1.2. Within Cydia, Saurik only recommends saving the iOS 6.1.3 SHSH blobs in the TSS Center (SHSH & APTicket) by tapping "Save 6.1.3 Now." Saurik also provided an explanation within Cydia about what happened to these SHSH blobs in a section called "Where is my iOS 6.0-6.1.2"
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Don't be discouraged, the fight isn't over yet. We'll surely have Untethered Jailbreak in iOS 7, which we can update to in the future, and we won't have to worry about the SHSH blobs in iOS 6.0.
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