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What is Downgrading?
Downgrading is the process of installing a previous version of iOS, the software on your iDevice. In order to fight fragmentation (and other things), Apple does not allow users to downgrade their iDevice software. So the jailbreak community had to come up with their own solution.
If you’ve ever updated your iPhone’s software through iTunes before, you’ve probably noticed the “verifying restore with Apple” message before. That’s iTunes, talking with Apple’s servers, to make sure you are installing the newest version of iOS.
How is Downgrading Possible?
With a little bit of text editing and the use of applications like TinyUmbrella, we can actually trick iTunes into thinking it’s talking to Apple’s servers. When in actuality, the sync-software is redirected to Saurik’s servers which gives the thumbs up to proceed with the restore of the older firmware.
Why Would I Need to Downgrade?
As mentioned earlier, app developers who want to make sure their applications are compatible with earlier versions of firmware would want to downgrade. The most common reason you’ll see on this site however, is to save a jailbreak.
Although it only takes us a click of a button for us, the work behind jailbreaking can sometimes take months. If you update to a version of iOS that hasn’t been jailbroken yet, downgrading will allow you to revert to a version that has.
What Are SHSH Blobs and How Important are They?
We won’t get too much into what SHSH blobs are (click here for our detailed explanation), but they are important. Like you typically-can’t-downgrade without-previously-saving-your-SHSH-blobs important.
The blobs contain your iDevice’s ECID (digital fingerprint) and play an important role in the communication between iTunes and “Apple.” This is why before you upgrade your iOS firmware, we ALWAYS recommend you save your SHSH blobs from the current version.
This can be done with programs like TinyUmbrella or iFaith. Both are free to download and fairly simple to use. We recommend saving your SHSH blobs on every jailbroken firmware you land on, so even if your iDevice gets accidentally updated in the future, you can always go back.
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