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Sep 23, 2015 9:28 AM in response to abicrawfordby D.Cohen,Hi! 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
As a final step, try the DFU mode. Note that this will erase all the data from your device.
- Connect your device to your computer using a USB cable.
- Turn off the device.
- Press and hold the Power button for 3 seconds
- Press the Home button while holding the Power button and hold both for 10 seconds.
- Release the Power button, but KEEP HOLDING the Home button.
- After about 15 seconds, iTunes will tell you it has detected a device in Recovery Mode.
- Restore your device
More info here: https://www.theiphonewiki.com/wiki/DFU_Mode
If these steps don't work, contact Apple and ask for help.