Samsung One UI 9 rollout for Galaxy S26: what’s available now

Samsung has started expanding One UI 9, its Android 17-based software release, beyond the foldables that debuted with it. The first conventional phones in the stable rollout are the Galaxy S26, Galaxy S26+ and Galaxy S26 Ultra. The initial rollout began in South Korea on September 16, 2026, while Samsung’s Singapore newsroom lists September 21 as that market’s start date—an important reminder that release timing is regional. 2524

Rollout status: where One UI 9 is available

Samsung’s global announcement says the rollout starts with the three Galaxy S26 models and will continue to eligible Galaxy smartphones and tablets in phases. Its Korean newsroom likewise says the update began domestically on September 16 and will expand sequentially to global markets. 2528

Market or device group	Confirmed status
Galaxy S26, S26+ and S26 Ultra in South Korea	Rollout began September 16. 2528
Galaxy S26 series in Singapore	Samsung lists a September 21 start. 24
Other eligible Galaxy phones and tablets	Planned in phases; Samsung has not published a complete global device-by-device schedule in the material available here. 2425
Galaxy Z Fold8 Ultra, Fold8 and Flip8	One UI 9 debuted on these devices before the S26-series expansion. 25
Galaxy S26 FE	Ships with Android 17 and One UI 9 rather than waiting for this OTA rollout. 26

A phased release means an update may not appear on every eligible handset in a country at the same time. Carrier configuration and whether a device was enrolled in beta can also affect when an OTA becomes available.

Android 17 foundation and the One UI 9 experience

One UI 9 is built on Android 17. Samsung describes the release as providing an easier, more seamless mobile experience across device form factors, alongside Galaxy AI that is richer, more personal and more helpful. 25

Samsung’s earlier One UI 9 beta announcement also framed the platform around expanded creative tools, customization options, accessibility improvements and stronger protection against potential security threats. 17 Those are high-level product themes, however—not a complete confirmation that every beta feature, or every implementation detail, is identical in the stable S26 build.

What Samsung has not detailed publicly in the supplied rollout material

The official rollout excerpts do not provide a full, S26-specific feature inventory. In particular, they do not establish:

• a definitive list of new or changed Galaxy AI tools;
• every interface, visual or usability change;
• a technical breakdown of privacy and security controls;
• a list of Android 17 QPR1 enhancements included in One UI 9; or
• a firm stable-release date for each additional Galaxy phone or tablet.

That distinction matters: Android version, One UI version and monthly security patch level do not by themselves confirm which individual Android platform features Samsung has enabled or customized on a given Galaxy model.

Firmware version, download size and September patch

Reports from the South Korean rollout identify the stable firmware family as S94xNKSU4BZI6. One report gives the Galaxy S26 Ultra components as S948NKSU4BZI6 and S948NOKR4BZI6. 110

The package size is not a single fixed number for all owners. Reports place the beta-to-stable OTA at about 550MB and, separately, about 650MB for beta devices. The difference may reflect device, build or installation history; neither figure should be treated as a guaranteed size for every S26, S26+ or S26 Ultra. A direct upgrade from an earlier software version is expected to require a larger download. 1103

Those same rollout reports say the stable build carries the September 2026 security patch. 110 Check the patch date and build number shown on the phone itself after installation, since regional firmware can differ.

What to do if the update has not appeared

On an eligible Galaxy S26-series phone, open Settings → Software update → Download and install. If One UI 9 is not offered, it does not necessarily mean the phone is ineligible: Samsung is releasing the software in stages, and market-specific schedules differ. 2425

Before installing, back up important data, use Wi-Fi where possible and ensure sufficient battery charge. Because a full upgrade can be materially larger than the beta-to-stable package, leave extra free storage available.

Bottom line

The facts that are clear are straightforward: One UI 9 is a stable Android 17 update, it began with the Galaxy S26, S26+ and S26 Ultra in South Korea on September 16, and Samsung is expanding it by market and device in phases. 2528 Samsung has confirmed the direction—more seamless use across form factors and enhanced Galaxy AI—but a comprehensive S26 changelog, a worldwide calendar and a verified Android 17 QPR1 feature list are still not established by the available official rollout information. 25