Your current settings may be overridden by the new update. As a result, there is a propensity for certain options or setting values to be changed, resulting in a dispute. The problem is that determining which settings or choices have been changed and need to be restored would be challenging. To repair this, use these steps to reset all settings on your iPhone 7 Plus:

1. From the Home screen, choose Settings.
2. Select General.
3. Restart by pressing the Reset button.
4. From the list of options, choose Reset All Settings.
5. If asked, enter your device's passcode.
6. To confirm the settings reset, tap the selection.