The new software update for Galaxy A51 is rolling out in Brazil bundled with firmware version A515FXXU5EUG7. It is a minor security patch update. Therefore, don’t expect to see any new features, performance improvements, or UI tweaks. Samsung Galaxy S10 5G is currently receiving the August 2021 security update on T-Mobile’s network in the US. It can be identified by the firmware version G977TUVS7FUG6. As of now, we don’t have the complete changelog, but it should not bring anything more than just a new security patch.
As mentioned in Samsung’s documentation, the August 2021 security patch fixes 40 vulnerabilities related to system security and privacy. If you’re a Galaxy A51 or Galaxy S10 5G user in the specified region, then you might have already received the update. If you haven’t, then manually update your phone by heading to Settings » Software updates and then tap on Download and Install button. We can expect the update to start rolling out in other regions over the next few days. [source 1, 2]