That’s it. iOS 9 is here. iOS 9 packs a lot of features in to slimmed new package. We already published how to install iOS 9 on your iPhone and iPad.
A lot of users experiencing an unresponsive “Slide to Upgrade” screen after updating to iOS 9. Apple recommends restoring your device from an iTunes backup to resolve the problem. Try this if anyone encountered a lack of responsiveness to the touchscreen.
1. Connect your iOS device to your computer and open iTunes.
2. Select your device. If you don’t see it listed, force restart your device by pressing and holding both the Sleep/Wake and Home button for at least 10 seconds, until you see the Apple logo.
3. If you made an iTunes backup of your device before updating to iOS 9, restore your device from that backup. If not, you need to make a backup of your device in iTunes, then restore from that backup.