I can't update my iPhone 11 Pro Max

Hello,

First, make sure you aren't still enrolled in a previous Apple Software Beta.

The easiest way to remove the public beta is to delete the beta profile, then wait for the next software update. Here's what to do: 

1. Go to Settings > General, and tap VPN & Device Management.
2. Tap the iOS Beta Software Profile.
3. Tap Remove Profile, then restart your device.

Next, carefully follow this guide to download and install iOS 16: Update your iPhone or iPad - Apple Support

Thanks for reaching out!

-Drake