Samsung Begins Stable One UI 8 Rollout for Galaxy S25 in Korea

Samsung began rolling out the stable One UI 8 update, based on Android 16, this week to Galaxy S25 series users in South Korea, marking the first widespread Android 16 release for a 2025 flagship outside of Google. The release includes the September 1, 2025 security patch and is expected to expand to markets such as the United States, United Kingdom, India and others in the coming days.

The update was first spotted in public posts by industry watcher Tarun Vats, who shared screenshots and build numbers for several regional variants, centered on an S25 build identified as S938NKSU5BYI3. Reports on download size varied depending on user status. Samsung announced on its Korean community forum that beta participants received a compact 555 megabyte transition package that converts their devices from the One UI 8 beta to the stable channel. Nonbeta users are receiving a full firmware download that industry reports put at roughly 3.4 to 3.9 gigabytes, with slightly different sizes reported for the standard S25 models and the S25 Edge.

Samsung said the company has closed the One UI 8 beta program for the S25 family and will not push further beta builds. Beta testers were advised to...