Samsung starts One UI 9 rollout with Galaxy S26 series
Samsung began the official One UI 9 rollout on 16 September 2026 with the Galaxy S26, S26+ and S26 Ultra, shipping the Android 17-based build S94xNKSU4BZ16 with the September 2026 security patch first in South Korea.
The details
- Samsung announced on 16 September 2026 that the official rollout of One UI 9 had begun.
- The rollout started with the Galaxy S26, Galaxy S26+ and Galaxy S26 Ultra.
- Samsung states that One UI 9 previously debuted on the Galaxy Z Fold8 Ultra, Galaxy Z Fold8 and Galaxy Z Flip8.
- SamMobile and Droid Life report that One UI 9 is based on Android 17.
- SamMobile gives the Galaxy S26 firmware version as S94xNKSU4BZ16.
- SamMobile reports that the update carries the September 2026 security patch.
- SamMobile reports that the stable update began in South Korea on 16 September 2026, with a download of around 550MB for beta testers.
- Samsung Thailand's newsroom listed 21 September 2026 for the Galaxy S26 series outside Korea and 28 September 2026 for the Galaxy S25 series, Galaxy Z Fold 7 and Galaxy Z Flip 7, a schedule SamMobile notes may apply only to Thailand.
- The same Samsung Thailand schedule states that One UI 9.0 will reach the Galaxy S23 FE by October 2026.
- Samsung Mobile Press states that the Scam Detection feature will be available in Japan, Canada and India.
Why it matters
One UI 9 is the Android 17 base that the rest of Samsung’s range inherits over the following months, so the S26 build is the reference point for what older Galaxy phones will eventually get.