Only 7 days after their second December update, BUL6, Samsung has begun rolling out their 5th Android 12 release for the S21 series of international devices.
Initially, as always, this is a staged rollout to the non-carrier branded, stock Samsung CSC codes first.
The Galaxy S21 international 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*BXXU3BUKG/BUL1/BUL6 builds on the international devices.
Changelog
- Device security improved
- Bugfixes
- After upgrading you will not be able to downgrade to the old software because of updates to the security policy.
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.
System information
The update = G99*BXXS3BULC
Download = 244.04MB
Build date = 21 December 2021
Release date = 24 December 2021
Camera version = 12.0.00.83 (no change)
One UI version = 4.0
Android Security patch = 01 December 2021
This is the 24th stable update for the Exynos model in 329 days. Average = 1 update every 14 days.
TOP TIP: Wipe the phone's cache partition and use the Galaxy App Booster after updating.
(N.B. This post will be updated as more information becomes available)
Got this morning UK S21U but with DBT CSC. 👍😊 Overall performance improved. Less heat. Nice update. No issues at all. Not tested battery life as my device is still on charge. 
Do not have it on BTU yet either.
Merry Christmas all 
