![]() ![]() 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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