This latest release is the18th for the Global, Exynos, S21 series and is currently being rolled out by Samsung only23 days after the September update,AUHD.
This update is for device security.
Initially, as always, this is a staged roll out to the non-carrier branded, stock Samsung CSC codes first.
This looks to be a fast roll-out with over 20 countries already released.
TheGalaxy S21 Global, Exynos, devices that will receive this update are...
S21 5G model SM-G991B
S21+ 5G model SM-G996B
S21 Ultra 5G model SM-G998B
This latest release replaces the previous G99*BXXU3AUHD build.
It is a FOTA, (Firmware Over The Air), update and you can check...Settings >Software update... to see if it is available for you. Alternatively, you can connect to the Samsung PC suite,Smart Switch and check via that.
Changelog
Overall stability of functions improved
The update =G99*BXXU3AUIE
Download =284.14MB
Build date =13 September 2021
Release date =28 September 2021
Camera version =11.0.03.24 (No change)
One UI version =3.1
Android Security patch = 01 October 2021
This is the 18th stable update in246 days. Average =1 update every14 days.
(N.B. This post will be updated as more information becomes available)