How to downgrade from iOS 8.1.2 to iOS 8.1.1If you had accidentally upgraded your iPhone, iPad or iPod touch to iOS 8.1.2 and want to downgrade back to iOS 8.1.1, then the good news is that you can downgrade as Apple seems to be still signing the iOS 8.1.1 firmware file. However, you will need to hurry up as Apple could stop signing any moment.
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How to downgrade from iOS 8.1.2 to iOS 8.1.1