How to downgrade iOS 16 beta to iOS 15.3

Review this guide published by Apple 👉 How to uninstall iOS beta software - Apple Support

Axel F.

Remove the public beta by deleting the beta profile

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

How to uninstall iOS beta software - Apple Support