Restore 64-bit iDevice to iOS 12.0-12.1.2 with SHSH2 Using 3uTools
Update on March 14th: Apple changed the iOS system restrictions, you may fail to install ipa file using Cydia Impactor at error 42. We will inform you as soon as it recovers.
V2.33 3uTools is finally released with the long-awaited downgrading feature, downgrade 64-bit iDevices with SHSH2. This tutorial will guide you how to downgrade step by step.
This feature is only available on iOS 11-12.1.2 iDevices. (You can not restore to iOS 12.1.1 beta 3 with SHSH blobs.)
The downgrading operation will not save any data, please back up your device in advance.
There are risks to downgrade with SHSH2, so this downgrading feature is recommended for experienced users. Once you fail or meet errors while downgrading, you would have to upgrade to the latest iOS version.
Face ID may not work for some iDevices restorng to iOS12.0-12.1. If your Face ID does not work, please try to restore again or upgrade iOS 12.1-12.1.2.
Similarly, you can also restore to unsigned iOS version if you have saved SHSH files before. This tutorial also works on A8 devices restoring to iOS 11.3-12.1.2, A7 devices restoring to iOS 10.2-12.1.2.
Or you can check the video tutorial first:
iPhone 8/ 8 Plus
iPhone 7/7 Plus
iPhone 6s/6s Plus
iPad 12.9-inch iPad pro 2nd generation
iPad 12.9-inch iPad pro 1st generation
10.5-inch iPad pro
9.7-inch iPad Pro
iPad 6th generation
iPad 5th generation
iPad Air 2
iPod touch 6th generation
1. Download the SHSH2 (of the iOS version you want to downgrade) you saved before on 3uTools or another tool.
2. Download NonceReboot12XX ipa file.
3. Download the iOS firmware you want to downgrade on http://www.3u.com/firmwares
4. Delete any software update on your iDevice.
If you saved SHSH2 file saved on 3uTools server:
If you never uninstall 3uTools, you could find the SHSH2 files in 3uTools’ cache folder.
Right-click 3uTools icon → click “Open file location”, and open “cache” folder, scroll down to find the right SHSH2 files of iOS version you want to downgrade.
If you saved SHSH2 file saved on Tsssaver server:
Please go to its website to download the SHSH2 of iOS version you want to downgrade. And open noapnonce folder to get the SHSH2 file.
Set generator nonce with NonceReboot12XX ipa
Step 1 Install ipa with latest version of Cydia Impactor. Go to Settings > General > Device Management, and open the just installed profile, and trust the developer.
Step 2 Enable Airplane mode on your iDevice, close Siri and reboot your iDevice.
Step 3 Open shshe2 file using any text viewer (eg. notepad)
Step 4 Search for <key>generator</key> and look beside it for actual key (eg. <string>0XXXXXXYYYYYYY</string>.
Step 5 Tap NonceReboot12XX on your device, and enter the above key code, and tap return to start set generator.
Step 6 Rename the SHSH2 file to .shsh from .plist.
Downgrade with SHSH2 using 3uTools
Step 1 Connect your iDevice to 3uTools and go to Flash & JB → Advanced, and click Download 64-bit iDevice.
Step 2 Read the popup carefully and click Select IPSW → Select SHSH, and double check the generator nonce you just entered.
Step 3 Select SHSH2 file, double check the generator nonce you just entered and click "Yes" to start downgrading.
Step 4 Confirm the connection between iDevice and PC, patiently wait for 20 to 40 minutes. Your iDevice will be restored to unsigned iOS 12.0 - 12.1.2 then.
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