Iphone 13 Pro Max White Screen after update to IOS 16.1.2

Hello CheeSeng83,

Welcome to Apple Support Communities. You can find help with getting your iPhone 13 Pro Max updated here:

If your iPhone or iPad won't update - Apple Support

Also, if you have access to a Mac or Windows PC with iTunes installed, you can get updated using the computer.

Follow the steps based on what computer you are using:

Update your iPhone, iPad, or iPod touch with the Finder - Apple Support

Update your iPhone, iPad, or iPod touch using your computer

1.Open a Finder window on a Mac with macOS Catalina or later.

2 Connect your device to your computer.

3.Select your device in the left sidebar of the Finder window. Learn what to do if you don't see your device.

4.Click General, then click Check for Update.

5.Click Download and Update. Continue by following the onscreen instructions.

6.If asked, enter your passcode. Learn what to do if you don't know your passcode.

Update your iPhone, iPad, or iPod touch with iTunes - Apple Support

Update your iPhone, iPad, or iPod touch using iTunes

1.Open iTunes on your Mac with macOS Mojave or earlier or on your Windows PC.

2.Connect your device to your computer.

3.Click the device button in iTunes toolbar. If you don't see your device, learn what to do.

4.In the Summary tab, click Check for Update.

5.Click Download and Update. Continue by following the onscreen instructions.

6.If asked, enter your passcode. If you don't know your passcode, learn what to do.

Let us know the outcome, and we can go from there if needed.

Best regards!