Samsung has now started rolling out the February 2024 security update to the Galaxy S23 series in the USA. The February 2024 security patch included in the new software fixes 72 security vulnerabilities found in the
Unlocked Galaxy S23 February 2024 security update details
According to the update changelog, the all-new February 2024 security patch update for the factory-unlocked versions of the Galaxy S23, Galaxy S23+, and Galaxy S23 Ultra comes with the build number S918U1UES2BXAD and has a download size of over 400MB.
Note that the latest firmware only contains a security update. You can install the latest update via tapping on Settings app >> Software update, >> Download and install.