A couple of weeks ago, Samsung released the One UI 6.1 update for the Galaxy S23 series and the Z Flip5 and Z Fold5 foldables, an update that will be remembered for bringing the new Galaxy AI functionality to the 2023 flagships. That update is now followed up with a security patch for April 2024. April security patch for the Galaxy S23 series It’s currently rolling out in Europe, where you should see the following firmware versions: S911BXXS3CXD2 – Galaxy S23 S916BXXS3CXD2 – Galaxy S23 Plus S918BXXS3CXD2 – Galaxy S23 Ultra F946BXXS1CXCH – Galaxy Z Fold5 ...
Source: https://www.gsmarena.com/samsung_starts_rolling_out_april_security_patch_to_galaxy_s23_series_z_flip5_and_z_fold5-news-62401.php