How to Fix iOS 15/14/13/12/11/10/9 Stuck on 'Slide to Upgrade' Screen Issue after Updating

Official solution to 'Slide to upgrade' bug in iOS 15/14/13/12/11/10/9

For some reasons, iOS 9's launch hasn't been a smooth experience for users. Many users who tried to update directly from their device were left frustrated by error messages. Perhaps it was due to many users trying to update the OS at once, which caused heavy traffic on Apple's servers. However, the solution was to stop downloading iOS and instead download the update from iTunes. If you have encountered iOS update stuck at “Slide to Upgrade” screen, take the following fix for it.

• 1. Connect your iOS device to a computer that you've previously synced with 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.

If you still see the “Slide to Upgrade screen” after completing the steps above:

• 1. Restore your device. If you don't see your device in iTunes or your computer won't trust your device, press and hold both the Sleep/Wake and Home button for at least 10 seconds, until your device restarts and appears in iTunes. When prompted, choose Restore.
• 2. After the restore is complete, set up your device as new.

Fix iOS 15/14/13/12/11/10/9 “Slide to Upgrade” Screen with iOS system care software-Tenorshare ReiBoot

If the above solution still can’t resolve iOS 9 stuck on “Slide to Upgrade” screen issue, the professional iOS system care software- Tenorshare ReiBoot can help you. This tool can help you fully fix iOS 9 stuck on “Slide to Upgrade” after updating without iOS data loss. It also enables to reboot your iPhone/iPad/iPod when it won't boot properly, even when your device's Home button is broken, device get stuck in Apple logo or iTunes logo/USB cable, reboot loop, etc during/after iOS 9 upgrade.

It’s compatible with Windows 10/8.1/8/7 and MacOS Big Sur, MacOS 10.15/10.14/10.13/10.12/10.11.4.

Step 1: Launch Tenorshare ReiBoot and connect your iOS 9 device with your PC.

Step 2: Enter Recovery Mode by clicking "Enter Recovery Mode" and then exit Recovery Mode. Then your device will boot up normally.

Done! After a few clicks, iOS 9 stuck on “Slide to Upgrade” screen will be solved completely. Then you can experience iOS 9 normally!