With the first untethered jailbreak of iOS 6.1 just around the corner there are a few important tasks that you should not do before using it in a jailbreak. In addition to a mandatory backup of data on each iOS device (either via iTunes or iCloud) should also be sure to back up the SHSH certificate for the currently installed version of iOS.
Thus a particular iOS version can be installed on an iOS device, a so-called SHSH certificate is required which roughly iTunes certifies that this iOS version must be installed on each iOS device.
The problem is that Apple issuing these certificates only for the latest version. So, for example, iOS 6.1 the latest firmware, you can not downgrade to iOS 6.0 without secured SHSH certificate.
This weekend to the first untethered jailbreak for iOS 6.0 / 6.0.1 / 6.0.2 / 6.1 named &# 8220; evasi0n&# 8221; to be published. Whether this jailbreak now supports future versions of iOS 6.x may be currently in doubt.
If Apple shortly after evasi0n actually iOS 6.1.1 release (and the vulnerability used close) and you accidentally installed this new version of iOS without SHSH certificate from iOS to have secured 6.1, there is no way back to iOS 6.1.
Therefore you should, no matter whether you jailbreak before has or not, always back up the SHSH certificate of the currently installed version of iOS. This must be done only once per iOS version. The device does not need to be jailbroken to secure the SHSH certificate.
However SHSH blobs allow only guaranteed with iPhone 3GS, iPhone 4 and iPod touch 4 to downgrade to an older iOS 6 firmware.
The SHSH certificates are stored in the following locations:
- WindowsC: \ Users \ username \ .shsh \
- OS X: /Users/Benutzername/.shsh/
- Linux: /home/Benutzername/.shsh/
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save SHSH certificate &# 8211; Preparation:
- TinyUmbrella (latest version 6.10.02a for Windows or OS X)
- USB cable
The following devices are supported by TinyUmbrella:
- iPhone 5 (all models)
- iPhone 4S (all models)
- iPhone 4 (all models)
- iPhone 3GS
- iPad 4 (all models)
- iPad 3 (all models)
- iPad 2 (all models)
- iPad mini (all models)
- iPod touch 5
- iPod touch 4
- AppleTV 3
- AppleTV 2
save SHSH certificate &# 8211; Manual:
- Connect your iOS device to the computer
- open TinyUmbrella
- links to &# 8220; SHOW ALL SHSHs&# 8221; click
- then &# 8220; Advanced&# 8221; Select and &# 8220; Request SHSH From Cydia&# 8221; deactivate
- Now on &Log; # 8220&# 8221; click; here we see whether saving the SHSH certificate has worked
- Now, right above the button &# 8220; Save ALL SHSHs&# 8221; click
- TinyUmbrella now saves the current SHSH certificate
When saving the SHSH certificate goes well, we should in &Console; # 8220&# 8221; window something to see in the way:
iPhone5_World 6.1 (10B143) ShSh SUCCESSFULLY saved!
If Apple the SHSH certificate for a specific version of iOS already no longer provide, it looks something like this:
APPLE is NOT signing iPhone5_World 6.0.2 (10A525) SHSH requests anymore.
In this example, I could always downgrade to iOS 6.1, but not on iOS 6.0.2.TinyUmbrella &# 8211; general &# 8211; A list of all saved SHSH certificates
As a final step we click on &General; 8220&# 8221; where they should now see listed for our device all locally on our computer (or on the Cydia servers) saved SHSH certificates.
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