Apple has published a new support record on its website that lays out a fix for customers experiencing an unresponsive “Slide to Upgrade” screen after updating to iOS 9 (by means of iPhoneHacks).
The problem has influenced an expanding variety of users on the Apple Support Areas, MacRumors discussion forum as well as social networks.
Apple recommends restoring your device from an iTunes backup to deal with the trouble.1.
Link your iOS device to your computer and open iTunes.
2. Select your device. If you do not see it noted, force reboot your device by pushing and holding both the Sleep/Wake as well as Residence button for a minimum of 10 secs, till you see the Apple logo design.
3. If you made an iTunes backup of your device before upgrading to iOS 9, restore your device from that backup. Otherwise, you have to make a backup of your device in iTunes, after that recover from that backup.Apple released iOS 9 on Wednesday for iPhone 4s or later, iPad 2 or later on and also the fifth-generation iPod touch or later on.