Contrary to the established traditions, Apple has not ceased to issue digital signatures to the old firmware following the release of a new one. Even two days after the release of iOS 8.1.2 users have the opportunity to return to the previous version of the operating system iOS 8.1.1. As a general rule, digital signatures cease to issue after 1-2 hours after the final release of the new OS.
Users who upgrade to iOS 8.1.2, it is possible downgrade - return to the previous firmware. It is only version iOS 8.1.1, which has yet to be signed Apple. It is worth remembering that the situation could change at any time. Therefore, anyone who is considering making a rollback, should hurry - the window will close soon.
Requirements:
- iPhone or iPad on iOS 8.1.2.
- IPSW-file iOS 8.1.1.
- iTunes 12 for Windows or Mac OS X.
How to downgrade iOS 8.1.2 to iOS 8.1.1:
Step 1: Save a backup copy of the data on your mobile device. This can be done by going to iCloud -> Backup -> Backup or by connecting the gadget to your PC and save a backup using iTunes.
Step 3: Open iTunes and connect your gadget with the operating system iOS 8.1.2 to your computer.
Step 4: In the icon bar of the program, select the icon for your gadget (far right).
Step 5: Hold the keyboard Shift (or Alt on OS X), click the Restore button.
Step 6: In the program, specify the firmware iOS 8.1.1 for your iPhone or iPad, you downloaded in step 2.
Step 7: Wait for completion of the procedure, the recovery will last from 5 to 10 minutes.Since Apple has signed iOS 8.1.1, certificates SHSH blobs to downgrade is not needed.