If your device turns on but gets stuck during start up
If you see the Apple logo or a red or blue screen during startup, try these steps:
Connect your device to a computer and open iTunes. If you don't have a computer, try to borrow one, or go to an Apple Store or Apple Authorized Service Provider for help.
While your device is connected, force it to restart.
On an iPhone 6s and earlier, iPad, or iPod touch: Press and hold both the Home and the Top (or Side) buttons at the same time. Keep holding them until you see the recovery-mode screen.
Don't release the buttons when you see the Apple logo. Keep holding until you see the recovery mode screen.
Select Update in iTunes.