iPhone Should I backup my 'SHSH Blob'? I'm unsure what they're for or how to use them.

[imDanielWood]

First off, let me apologies for my 'noobiness', but we all have to start somewhere.

I've heard of these before but never really have backed it up or understood how they're used. I know they're for downgrading to a lower version of iOS if you ever need too, or at least I think they are...?

At the moment I'm on iOS 6.1.1 on my i4S, I've downloaded the newest version of TinyUmbrella, when I open it I get some pop-ups about requesting SHSH from cydia and another one, it recommends I turn off 'Request SHSH from Cydia' which I have done.

Could somebody tell me which options to use and how to properly use an SHSH blob?

I have an iPhone 4S, running iOS 6.1.1 which is NOT unlocked, I have it on contract with T-Mobile (EE).

Any help would be really appreciated as I want to be fully secure and be able to jailbreak again even is an iOS update is released which stops jailbreaking for a while.

Thanks!

EDIT: I followed http://www.idownloadblog.com/2013/02/02/how-to-save-shsh-blobs-for-ios-6-1/ to save my SHSH blob, but I'm still unsure how to use them in the future to downgrade to 6.1.1 if I need too, so Any information on that would be nice, thanks!

 

[dhlizard]

Here is the place to start understanding what they are and how Apple uses them.

http://www.saurik.com/id/12

I recommend you save them for each device for each new firmware version.
Use TinyUmbrella to save them.

At present, the opportunities to use them for a restore in iOS6 on your device does not exist, but a method may be found in the future.

 

[lissa5168]

I don't believe 4S phones can downgrade ever. The purpose for us is to be able to restore to 6.1.1 after Apple closes the signing window.

Example: When iOS 6 first dropped, I stayed with my JB 5.x because I didn't want to lose JB. Since 6.0 was out, Apple stopped signing the iOS 5 version. If something went wrong, I could have restored to 5.x (the same version I was on) because I had saved my blobs. If I hadn't saved my blobs, I would have no choice but to restore to 6.0 which was the only version Apple was signing.

 

[imDanielWood]

Thank you guys, I understand now, I've saved mine just in case.