Some updates may automatically supersede your current settings. And this may result in one of two outcomes: good or terrible. Unfortunately, the conclusion was negative in your situation, as you were unable to hear anything from your iPhone 7 after applying the latest update. To eliminate this possibility, consider resetting all settings and then configuring individual features, including audio functions, as needed. To accomplish this, simply follow these steps:

1. To get started, go to the Home screen and tap Settings.
2. Select General.
3. Reset may be found by scrolling down and tapping it.
4. From the list of options, tap Reset all settings.
5. Continue by entering your device's passcode.
6. Finally, hit the option to approve the reset of all settings.