iPhone 6s: iOS 15 Update

1. Settings > General > Software Update

2. Software Update:
    iOS 15.4.1
    Preparing Update...
    Install Now

3. Terms and Conditions: Agree

4. Verifying update...

5. Phone auto reboot

6. Updating with progress bar

7. On hello, Press home to open

8. Enter your passcode: [passcode]

9. Software Update Complete Your iPhone has been updated to iOS 15.4.1 > Continue

10. iPhone Analytics: Don't Share

11. Appearance: Light
      Continue

12. Welcome to iPhone: Get Started

URL: https://www.apple.com/my/ios/ios-15/