Open the Settings app
Tap General
Tap Software Update
Wait for the iPhone to check for updates
If an update is available, tap Download and Install
If prompted, enter your passcode
Keep your iPhone connected to Wi-Fi and power during the update
Open the Settings app
Tap General
Tap Software Update
Wait for the iPhone to check for updates
If an update is available, tap Download and Install
If prompted, enter your passcode
Keep your iPhone connected to Wi-Fi and power during the update