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Helpful answers
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Sep 21, 2015 9:35 AM in response to Veta209by D.Cohen,Many users report various iOS 9 issues. The steps below have helped a number of users to cope with these issues, so I guess you can try them as well.
Take a look at this article.
If the Slide to Upgrade screen won't go away after you update to iOS 9 - Apple Support
If this doesn't help, try the steps below.
Try to reset your device. This won't delete your data stored on this device.
- Press and hold the Sleep/Wake button
- Press and hold on the Home button
- Keep holding both buttons until the display turns off and back on with Apple logo on it.
Alternatively, you may go to Settings - General - Reset - Reset All Settings
https://support.apple.com/en-us/HT201559
If this does not help, restore your device to factory settings. Note that this will erase the data from your device.
Take a look this Apple Support article: Use iTunes to restore your iPhone, iPad, or iPod to factory settings - Apple Support.
As a final step, try the recovery mode. Turn your device off, then plug it to your computer with the home button pressed. Keep the Home button pressed until you see the iTunes logo on the screen of your device. After that on your computer you should see the iTunes window saying your device needs to be restored to factory settings. Click on the restore button.
https://support.apple.com/en-us/HT201263
Here you can find some useful tips on how to make the battery life of your device longer. They work for both iOS 8 and iOS 9.
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