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Can someone please explain SHSH Blobs? I keep seeing people talking about them in the jailbreak community and I have no idea what they are or if they're important? Thanks

asked 03 Feb '13, 19:45

JackST's gravatar image


The JailbreakQA FAQ has an explanation of SHSH blobs:

What do the words "SHSH blobs" mean? SHSH blobs are digital signature files unique to your device.

Why are SHSH blobs important? Apple only allows you to restore to the iOS versions (firmwares) they "sign" (by providing SHSH blobs), in order to prevent you from restoring to earlier versions that may be easier to jailbreak. Apple's "signing" of each iOS version only lasts for a limited time, usually just for as long as that iOS version is the latest version available. Once Apple stops signing an iOS version, there is no way to restore that version again, unless you have SHSH blobs saved for that version (and even then, it's not always possible on newer devices). If your device is currently on a version that Apple is no longer signing, restoring with iTunes will upgrade your device to the latest version available for your device.


answered 03 Feb '13, 19:55

britta's gravatar image


Think of it as a way to downgrade in the future, when apple releases a new iOS they basically block restoring old versions, so saving SHSH blobs will possible help you downgrade in the future so you can use the jailbreak again.


answered 03 Feb '13, 19:47

12341251223's gravatar image


See this iPhone Wiki page for a good explanation.


answered 03 Feb '13, 19:47

iphpwn4's gravatar image

iphpwn4 ♦

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Asked: 03 Feb '13, 19:45

Seen: 1,541 times

Last updated: 03 Feb '13, 19:55

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