How do I use SHSH blobs saved by Cydia to downgrade an iPhone 4S?
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rocus • December 15, 2012 at 5:36pm
I have an iPhone 4S that was upgraded to iOS 6 and I want to downgrade it back to iOS 5. Cydia shows that SHSH blobs are saved for my device, but I cannot retrieve them using Redsn0w or TinyUmbrella. Where are these blobs stored and how can I access them to perform a downgrade?
Answers
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iClarified • January 12, 2026 at 4:11am
SHSH blobs are unique digital signatures that Apple uses to verify the version of iOS you are trying to install. When Cydia displays saved blobs at the top of the app, it indicates that the TSS signatures were cached on Saurik's servers while Apple was still signing that specific firmware. To retrieve these, you typically use a tool like TinyUmbrella or Redsn0w, but these tools may fail if the servers are no longer reachable or if the blobs were not saved with the required APTicket data. For the iPhone 4S, downgrading from iOS 6 to iOS 5 is notoriously difficult because the device requires a valid APTicket for the restore process. Even with saved blobs, unless you also have the corresponding high-level signatures that were captured during a specific window, a downgrade is usually not possible for this hardware model.
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Guardmy6 • December 16, 2012 at 3:45pm
Unfortunately, it is generally not possible to downgrade an iPhone 4S from iOS 6 back to iOS 5. The iPhone 4S and newer devices use a security mechanism called APTicket, which makes SHSH blobs alone insufficient for a restore once Apple has stopped signing the firmware. While Cydia may show that blobs were saved, they often cannot be utilized for a downgrade on this specific hardware.