How to update my iPhone to iOS 16.6.1?

Hello hnin185,

You can update your iPhone using the steps below:

1. Back up your device using iCloud or your computer.

2. Plug your device into power and connect to the internet with Wi-Fi.

3. Go to Settings > General, then tap Software Update.

4. If you see more than one software update option available, choose the one that you want to install.

5. Tap Install Now. If you see Download and Install instead, tap it to download the update, enter your passcode, then tap Install Now. If you don't know your passcode, learn what to do.

You can also find those steps in this resource: Update your iPhone or iPad - Apple Support

Should you still be unable to update your iPhone, do you receive any errors or prompts during that process?

Let us know, and we'll keep moving forward from there.