Anyone can tell me why there is no update Tell me how to show it

Anyone can tell me why there is no update
Tell me how to show it

Your device may not support the iOS 17 update.
Check the list of devices that can be updated to iOS 17: iOS 17 and iPadOS 17 Supported Devices List

I don’t want iOS 17 I want iOS 16

I see your device seems to have updated to the latest iOS 16 version (currently iOS 16.7.5). I’m not sure what else you’d like to update?