Help ... Note 10+ "No Network Connection"

Hi,
So i have a galaxy note 10+ N975F for over an year now.
the device is in its original state with Official status. Today i got the august security patch so i downloaded and installed it.
but after installing now i have no network connection/emergency calls only. everything else is working and device is still in official status
but not getting any connection ??
any help would be appreciated ??

Thanks