Often ask us this question (I've upgraded the iOS by mistake and lost jailbreak can I return to the old firmware and work Jailbreak again?), and in most cases we answer NO
So why cannot go back to Old firmware, is not a simple matter to open firmware links page and then choose which version you like and then you download and save it to your computer and then doing a Restore as teach you before. No ... no ... no ... it's not that simple. Apple prevents the restoration of any Old firmware on your device. And if you do so you will be surprised of the iTunes program error and would eventually have to put the last firmware that allows Apple device.
How do you Apple restrict me? And how do you know I do I download an earlier firmware? In short every time you do install the firmware on your iTunes program takes permission from Apple's servers and these servers reveal if this another firmware version or not if another version send you approval and therefore it can install the firmware you want Apple only.
Question now is what does the user who upgraded with error and wants to return to the previous release Downgrade of the operating system? The answer is it cannot do anything unless you have locked himself and save this approval from Apple on his computer or on Cydia servers. And so can always refer to the version in which the save files approval from Apple.
In this article we will explain how the way to do it, and how to copy SHSH key for your device, which represents Apple's approval to install the firmware. Follow us and always remember to save these files, especially if you are a fan of jailbreak. Or your phone was closed on a single network.
The beginning of what is SHSH?
This icon represents a special key or signature give Apple all firmware gives each device user and are generated by him through certain keys in the device called ECID and has been confirmed the identity of the operating system with each update conducted via iTunes, where if you notice when you any upgrade or restore the appearance the phrase "Verifying restore with Apple." and that it is verifying this signature and issued in all entertainment, and in this way ensure Apple also said it is not installed system lower than the current system from Apple, and each SHSH expiry date certain ends when no longer useful, with each new update issued by Apple sends to your computer via iTunes SHSH new related to this update and it is impossible to do so to return to the previous Edition.
What’s program TinyUmbrella?
This tool helps in the process of keeping a key or signature file SHSH on your device to take advantage of them later as we explained as well as help this tool in an upgrade to the latest update to the iPhone without upgrade baseband and thus preserving the jaw lock the network in the iPhone that also actually before.
This tool consists of two parts:
Umbrella:
Used to get SHSH file as mentioned and save it in your computer to allow for Downgrade future without any problem. This option works even with devices that are not jailbreak.
TinyTSS:
Used to perform an upgrade of the operating system without upgrading baseband allowing preserving the status of unblocking network.
Practical steps to save the key SHSH:
Went to the following website link from your computer and download the program TinyUmbrella and from the second box in the right so that you choose the link by the operating system you are working on (Windows, Mac, Linux).
After downloading the program copy it to your Applications folder if you're working on a Mac, or if you're on Windows right click on the program icon and select Run as administrator
In Windows, if you get a warning message before running the program, press the button Allow Access
In the main program interface will ask you to connect your device to your computer, do so.
After connecting the iPhone will recognize the software and the operating system version and baseband and other information
Check the box Advanced Options above and you'll see additional options then which makes sure a copy operating system for the iPhone and it's consistent with your device and also in the box Location Select Cydia (Note you can get the SHSH only from the latest issue of the operating system for the iPhone.)
Then click Save My SHSH button at the top and then will bring this key you if this process succeeds will receive the following message:
“You have saved your SHSH locally and the request was sent to CYDIA. This means that CYDIA DOES have your SHSH. Do NOT bug semaphore about the Cydia home page showing this version.”
and you'll see a word Successfully green in the lower screen.
Clicking on the Click Here To Open that appear to act as a blue in the lower screen will take you to the key file SHSH and location on your computer and you can also see this key by clicking the button Display SHSHs at the top.
Thus has now become the key to your device's SHSH so you can now work with Downgrade of the current firmware which took SHSH key him at any time if I had to. And we will do an essay explaining how Downgrade who work kept the SHSH key.
Source :
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