According to Sammobile report, the new software update is currently rolling out in Europe. It can be identified by the firmware version G99xBXXS3AUHD. It is a minor security patch that does not bring any new features, performance improvements, or changes to the user interface. Samsung has not yet detailed the September 2021 security patch. So, the list of vulnerabilities getting fixed is currently unknown. Usually, it is announced in the first or second week of the month.
While Samsung is busy preparing for One UI 4.0 beta, the company has not diverted its focus from the monthly security update rollout. The company recently announced that the Galaxy S21 users will soon get One UI 4.0 beta update which is based on Android 12. Galaxy S21, S21+, and S21 Ultra is receiving the newest security update in Europe. We can expect the update to start hitting other regions over the next few days. You can manually check for the new update by navigating to Settings » Software updates.
