S25 Ultra is getting security updates every month, it seems there is an issue with your device. Kindly Take a backup of your data and try to Reset Settings ONLY first and check for updates, if it's not working try to do factory reset once. Hope it will resolve the issue.
Have you ever withdrawn from BETA software? In case you have, do visit an official service centre. They will get it fixed for you. Don't try to do anything on your own.
As per your query, we would like to inform you that the security patch of the device may vary depending upon the region and serial number so kindly wait for it you will be notified when it is released for your device. If you require further assistance, please feel free to write back to us. We will be more than happy to help you.
