Following a month of beta testing, Samsung has officially rolled out the stable One UI 8.5 update—built on Android 16—for its 2023 flagship smartphone lineup.

South Korea is, unsurprisingly, the first market to receive the official upgrade. The new firmware for the Galaxy S23, S23+, and S23 Ultra drops under the build number S91xNKSU7FZDT. If Samsung sticks to its usual rollout playbook, users in other international markets should see the update hit their devices within the next week or so.

One UI 8.5 doesn't just bring the core enhancements of Android 16 QPR2 under the hood; it also introduces a major design overhaul. The system interface has been refined to feel more minimalist, fluid, and intuitive. Furthermore, the South Korean tech giant has baked in deeper personalization options and refreshed its suite of default apps to match the slick new aesthetic.

For Galaxy S23 owners in Vietnam, you can check if the update is live by heading to Settings > Software update > Download and install. Because this is a staged rollout, don't panic if you don't see it immediately—availability will vary depending on your specific region and mobile carrier.