1. Settings > General > Software Update
2. Software Update:
iOS 15.1.1
Download and Install
3. Enter Passcode:
Enter your passcode: [passcode]
4. Terms and Conditions: Agree
Terms and Conditions: Agree
5. About xx seconds remaining > Preparing Update...
6. Software Update: Install Now
7. Verifying update...
8. Phone will be reboot for update to complete
9. Software Update: Your iPhone has been updated to iOS 15.1.1
