Apple only issues signatures for the currently-available iOS version, which disallows installing older iOS versions. This signature is needed to restore a specific iOS version it is generated by Apple based on hardware keys of the device and the hash of the firmware. This often also refers to backup files with the signature ("SHSH blobs"). Technically, the SHSH of a firmware image is a 1024-bit ( 0x80 bytes) RSA signature. Step 5 Normally, it would take around 10 minutes to downgrade.Īfter the process is finished, you will see the familiar interface of iOS 6, now you can activate your phone and enjoy it.SHSH, or "Signed Hash" is a 1024-bit RSA signature that is verified by the bootloader before execution of an image is permitted. Step 4 Now 3uTools will automatically flash your iDevice, please confirm the connection between your iDevice and pc. Step 3 After you import the firmware, click “Flash” on the right bar. Step 2 Launch 3uTools and go to “Flash & JB” -> “Pro Flash”, click “Import Firmware” and select the firmware you have already downgraded. For iPad 2,4, you can refer this tutorial to enter KDFU mode: How to Enter KDFU Mode Using Futurerestore?
Please make sure your iDevice is in KDFU mode, then continue to downgrade. Only when your iDevice is in KDFU mode, you can downgrade to iOS 6.1.3. Step 1 Launch Cydia and add repo: to enter KDFU mode (Please check the detailed tutorial). You are suggested to backup your device before you downgrade. This downloading would not save any data.
You can check the product type of your device on 3uTools, then download the corresponding firmware. This downgrading tutorial only applies to iPhone 4s and iPad 2 (Product type: iPad2.1, iPad 2.2, iPad 2.3 and iPad 2.4). Jailbreak your iDevice: Please update your iDevice to iOS 9.3.5 to jailbreak.Ĥ.
Download the corresponding custom firmware for your iDevice Download and install the latest version of 3uTools.Ģ. Now V2.17 3uTools supports downgrading iPhone 4s and iPad 2 to iOS 6.1.3 after jailbreak without SHSH.Īfter you downgrade to iOS 6.1.3, you can check iOS software update on your iDevice to upgrade to iOS 8.4.1.ġ.
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