![]() 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 Ultimately, however, Rapid Security Responses are a positive development, enabling users of all Apple devices to receive faster, less disruptive security protection.įollow Gordon on Facebook MORE FROM FORBES Apple iOS 16.4.Part 2: Is It Possible to Restore Unsigned IPSW? The problem is you could be waiting weeks or even months because Apple will no longer be rushing out iOS updates solely for security purposes now RSRs exist. ![]() Devices limited to these iOS versions will receive security updates the old way, with Apple bundling the patches inside iOS updates. Note: RSRs are also not being released for iOS 15 or any other previous iOS generation. ![]() That said, the downside is some iOS updates introduce bugs, which can cause understandable hesitation to upgrade but now come with the penalty of missing out on RSRs. This is a clever way to force iPhone owners to keep their software up to date. Right now, that means iOS 16.4.1, but when iOS 16.5 comes out, any iPhone still running iOS 16.4.1 will not be able to install the next RSR release until it is running iOS 16.5. The difference is they are only available to iPhones running the latest version of iOS. RSR releases will send you a notification, just like iOS updates. How To Get A Rapid Security Response iPhone Update How this will affect beta testers is currently unclear. Should iOS 16.5 be released first (it is currently in beta testing), then the next RSR release would be titled iOS 16.5 (a). iOS 16.4.1 is the current version of iOS 16, hence the iOS 16.4.1 (a) name, and should a second RSR release be required before the next iOS update, it will be iOS 16.4.1 (b). While iOS updates use numbers, RSR releases are signified by a letter in brackets. How To Spot A Rapid Security Response iPhone Update By their nature, these fixes are urgent responses to serious security vulnerabilities, and Apple will be reluctant to publicize what the vulnerabilities are before the majority of iPhone and iPad owners have had the chance to update.
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