As per your concern, we want to inform you that the April and May security update already has been released for the Galaxy S24 ultra series. you can check the software update on your device manually by the below steps.
Kindly follow the below steps to update your device software( if available). Path: Settings > About phone > software update.
If still not recieving, kindly visit the service center once and inspect your device by the technical team end. They will provide you with all the information in a better way after inspecting the device physically.
