If your device can do update iOS, all you have to do is follow the steps below.
1. Open iPhone then go to Settings > General > Software Update. After that, wait for the update to appear.
2. If it appears press download and install for the latest iOS.
3. If there is a choice download and install for iOS 15.7, you can just ignore it and hit the button upgrade to iOS 16 which is at the bottom then press download and install for iOS 16.
4. After that enter passcode in order to get started update.
5. If it’s finished downloading, all you have to do is do it reboot device then wait for iOS 16 to install.
6. Follow the instructions that appear while the installation is running.
7. After that update even finished.
(Tin/Isk)