Apple has finally shut the doors on iOS 8.1.1. It is no longer being singed, meaning, you can no longer downgrade iOS 8.1.2 to 8.1.1. You can also no longer restore or update to iOS 8.1.1 from a previous version of iOS on your iPhone, iPad or iPod touch. Apple released iOS 8.1.1 back in November, followed by iOS 8.1.2 only last week.