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Hello there! follow the steps below to force the upgrade
make sure you have a pc or mac with itunes installed.
Plug your device into your computer with a USB cable.Turn off the device.Hold the Power button for 3 seconds.Hold the Home and Power buttons for 10 seconds.Release the Power button but keep holding the Home button.After about 15 seconds you will be alerted by iTunes saying that it has detected a device in Recovery Mode.
Make sure the device screen is blank and no logos are presentRestore with itunes as a new device.