Samsung began rolling out the Android 13-based One UI 5.0 stable update for the Galaxy A51 5G last year, which is now seeding for the unlocked Galaxy A51 5G units in the US. The update comes with firmware version A516U1UEU8FWA4 and brings the usual One UI 5.0 goodies to the Galaxy A51 5G. You can read our One UI 5.0 review to learn more about it. However, instead of the February 2023 Android security patch, the One UI 5.0 update comes with the dated December 2022 security patch. That said, if you live in the US and haven't received the One UI 5.0 update on your unlocked Samsung...
Source: https://www.gsmarena.com/unlocked_samsung_galaxy_a51_5g_android_13_one_ui_5_update_usa-news-57503.php