Step 2: Open iTunes on your PC and navigate to the iPhone device information page by clicking the mobile icon at the top screen. Step 1: Connect your iPhone to your Mac or Windows computer using a data transfer cable. For how to save and restore SHSH2 blob files, see the steps below. You can start saving the digital signature of your current iOS firmware now for possible future use. Online tools like TSS Saver can help with blob saving. Once Apple stops signing an iOS firmware version, the signature is removed, and then, you can't restore the firmware. You must have saved a blob (digital signature) file of the iOS version you want to restore while the version is still being signed by Apple. When Apple stops signing a particular firmware, it removes the sign (signature) from the firmware so users won't be able to downgrade to it. These blob files are the digital signatures that Apple places on each IPSW firmware file for each iOS device. It is possible to restore unsigned IPSWs with the help of SHSH2 Blobs. These requirements will continue to expand below. So, to downgrade to a previous iOS firmware that has stopped being signed by Apple, the basic requirements are: Anyone trying to install unsigned IPSW firmware through iTunes will only get an error message. Normally, when you want to upgrade or downgrade iOS version using IPSW restore file, you will do it through iTunes.ĭuring the downgrade process, iTunes will make some verifications and checks with Apple servers to ensure you are restoring a signed IPSW file. Yes, you can restore your iOS device to unsigned IPSW firmware。 But not through the traditional way like iTunes. To resolve firmware update errors and problems, reverting to a previous stable iOS version is a common solution. However, new versions of iOS software often cause unpleasant experiences to device performance and functionality. iOS users will not be able to restore to unsigned firmware using iTunes.ĭue to security concerns, Apple will periodically unsign iOS version and encourages users to use the new features offered by new iOS version updates. An unsigned IPSW means Apple has stopped supporting the iOS version. IPSW is the file extension of Apple’s iPhone mobile operating system. Method 3: The Easiest and Fastest way to Downgrade iOS Method 2: Restore Unsigned IPSW by FutureRestore Method 1: Restore Unsigned IPSW Using SHSH2 Blobs Part 2: Is It Possible to Restore Unsigned IPSW?
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