Build Number : G991USQU4AUIL
Android version : R(Android 11)
Release Date : 2021-10-11
Security patch level : 2021-09-01
• Overall stability of your device has been improved.
• The security of your device has been improved
I just checked for updates for the heck of it and found a new update. It wasn’t clear initially what it was, but it showed Sept 1 security patch, so I was a bit confused. It appears it’s a stability update based on the change log.