Apple constantly updates its firmware to fix issues on previous iOS versions or introduce new features. However, these updates sometimes tend to come with new bugs and other glitches that can make using the updated iOS very annoying.
One way to solve these issues is to revert to an earlier stable iOS version. The problem is that Apple usually stops signing its older iOS versions once it releases new versions, meaning they are no longer supported by their iDevices.
So, what happens if Apple stopped signing the iOS version that you want to move back to? Can you restore unsigned IPSW of that particular version? Yes, you can. In this article, we’ll show you exactly how to restore an unsigned IPSW on your iPhone to avoid those bugs and other issues that a new iOS update might have brought.
Every version of iOS usually has a signature which is technically a piece of digital code that Apple sents from its servers. For instance, when you install a new iOS version using iTunes, a signed code is added. On the other hand, the signature for the older iOS version gets deleted two weeks after Apple releases the updated iOS system.
This digital signature from Apple plays a vital role when it comes to installing newer and older iOS versions. So, how exactly does it work? When you want to install a new iOS version, you have to first download the software update on your iPhone or PC.
However, before the software can be installed on your iPhone which has the previous iOS system, or the PC, the hash version is first sent to the Apple server. This is to confirm in deed the hash exists and also matches an installable generated iOS version.
From there, Apple generates a private key which helps sign the request thereby granting the iPhone or PC permission to start installing the iOS version. That’s it!
You can install a new or any older iOS version that’s still signed. However, if the iOS version you intend to install is one of those no longer signed, then you can’t install it. Apple often stops signing these older versions in order to encourage iOS users to utilize the latest iOS systems.
They also do it in order to stop or make jailbreaking iPhones and other iOS devices and software much more difficult. You can still download IPSW files though. The only problem is that you can’t install them directly like a regular iOS system update.
In this section, we’ll take you step by step on how to restore to an unsigned IPSW with SHSH blobs. Following these steps will enable you to revert to that unsigned iOS that you want.
If you have everything set, then follow these steps to restore unsigned IPSW with the SHSH blob file.
While using the above methods can help you downgrade iOS, they are still risky and very complicated. You can avoid going through all that technical process by using an easy solution like FoneGeek iOS System Recovery. It’s pretty simple to use - no running command lines or handling IPSW files. It takes just a few clicks to downgrade or upgrade the iOS system on your iPhone and there’s no data loss.
Key Features of FoneGeek iOS System Recovery:
How to restore to an unsigned IPSW with FoneGeek iOS System Recovery
Step 1. Get first the FoneGeek iOS System Recovery program. Once downloaded, install and launch it on your computer. Select Standard Mode.
Step 2. With a USB cable, connect your iPhone to the computer, then click Next. Your device will now be detected by FoneGeek iOS System Recovery program.
Step 3. A new interface page displaying your iPhone model plus several iOS firmware packages will appear. Because you want to downgrade, select the iOS version you want to downgrade to (lower iOS to your current version). Click “Download” button.
Step 4. Your firmware will start downloading. Wait for it to finish. When it does, click “Fix Now” to initiate the downgrade process. The program will start installing the older iOS firmware package on your iPhone and prompt you once the downgrade finishes.
Q1. Can I downgrade iOS with jailbreak?
Apple doesn’t permit iOS users to downgrade the software of their iDevices so as to prevent fragmentation (plus other things). So, the jailbreak community decided to develop its own solution. However, keep in mind that downgrading firmware doesn’t mean your baseband or rather, “modem firmware” will be downgraded too for unlocks.
Q2. What is SHSH2?
SHSH and SHSH2 blobs simply refer to the digital signatures used by Apple to create specific IPSW files (iOS software in other words) for each iDevice they make. It’s a method aimed at ensuring only trusted software gets installed on their iPhones, iPads, and also iPod touches.
Q3. Is it possibie downgrade to unsigned iOS without blobs?
It’s basically not possible to downgrade to or restore an unsigned iOS via iTunes because it’s not an official thing that Apple permits.
You can’t really downgrade to unsigned iOS version without blob files. That’s why there are third parties to help you with that. You can do it unofficially using a third-party program such as FutureRestore or the FoneGeek iOS System Recovery. In fact, we highly recommend the FoneGeek iOS System Recovery if you want to avoid all the technical processes.
As a professional writer who is interested in technology, Edwin J. Parke has helped thousands of users by offering various tips to solve their problems.
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