This is to confirm in deed the hash exists and also matches an installable generated iOS version.įrom there, Apple generates a private key which helps sign the request thereby granting the iPhone or PC permission to start installing the iOS version. 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. 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. This digital signature from Apple plays a vital role when it comes to installing newer and older iOS versions. On the other hand, the signature for the older iOS version gets deleted two weeks after Apple releases the updated iOS system. For instance, when you install a new iOS version using iTunes, a signed code is added. What Is Unsigned IPSW?Įvery version of iOS usually has a signature which is technically a piece of digital code that Apple sents from its servers. 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. 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.
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. One way to solve these issues is to revert to an earlier stable iOS version. However, these updates sometimes tend to come with new bugs and other glitches that can make using the updated iOS very annoying.
Apple constantly updates its firmware to fix issues on previous iOS versions or introduce new features.
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