Samsung One UI 9 Test Builds Spread Across 28 Galaxy Devices

Samsung One UI 9 test builds have surfaced across 28 Galaxy devices in the past month, even as the public beta stays locked to the Galaxy S26 series in six markets. The running tally on Samsung’s own internal firmware servers now spans the S, Z, A, and Tab product lines, offering the clearest preview yet of which phones and tablets will move to Android 17 first.

The first wave of the public beta opened this week on Samsung’s terms. One UI 9, built on Android 17, is live for Galaxy S26, S26+, and S26 Ultra users in Germany, India, Korea, Poland, the United Kingdom, and the United States, with sign-ups open through the Samsung Members app. The Indian firmware carries version S94xBXXU2ZZEQ and ships with the June 5, 2026 Android security patch, weighing over 3.7GB; the second beta in the UK and Korea weighs about 1.6GB.

What the Galaxy S26 Beta Includes Today

Samsung’s own official One UI 9 beta announcement and features lays out the changes in four buckets. Samsung Notes gains decorative tapes and a wider set of pen line styles. The Contacts app now links straight into Creative Studio for personalized profile cards, without the user jumping apps. The Quick Panel splits brightness, sound, and media player into independently adjustable controls with more size options.

The fourth bucket is accessibility: an adjustable Mouse Key speed, a combined TalkBack package that folds Samsung and Google features together, and a new Text Spotlight that displays selected text larger or more clearly in a floating window. A fifth bucket sits on top: One UI 9 now warns users, blocks execution and installation, and recommends deletion when new high-risk apps appear, fed through Samsung’s security policy updates. The same channel extends to apps already on the phone; an app installed earlier that gets flagged later can be blocked from launching and pushed for deletion. Samsung’s runtime phishing block for One UI 9.0 adds more detail on the security push.

28 Devices Are Already Pulling Internal Test Builds

The wider signal sits on Samsung’s internal servers, where firmware builds for unreleased and current Galaxy devices keep showing up. SammyGuru’s running list of One UI 9 test build devices, last updated June 19, 2026, puts the count at 28 across four product lines. The S series leads with the Galaxy S26, S26+, S26 Ultra, S25, S25+, S25 Ultra, S24, S24+, S24 Ultra, and S24 FE. The foldable list includes three unreleased models, the Galaxy Z Fold 8 Ultra, Z Fold 8 Wide, and Z Flip 8, alongside the Z Fold 7 and Z Flip 7. The A series covers the Galaxy A57, A56, A34, the unreleased A18, A17, and A16. Tablets round out the count with the unreleased Tab S12+ and Tab S12 Ultra, plus the Tab S11, Tab S11 Ultra, Tab S10+, and Tab S10 Ultra.

The test build list has already moved beyond the first wave. The India expansion and One UI 9 Beta 2 changelog shows Samsung pushing the second beta to the S26 series in the UK and Korea, while budget additions continue. SammyGuru has separately confirmed that the Galaxy A16 5G and Galaxy A35 have appeared with their first One UI 9 firmware on European test servers, with build numbers A166BXXU8EZF1 and A356BXXUAEZF1, both spotted by tipster Tarun Vats. How Samsung announced the One UI 9 beta frames the same expansion as giving Samsung more time to work out bugs before public release.

The shape of the list breaks down across the S, Z, A, and Tab product lines, with three foldables and two tablets marked unreleased. The Z Flip 8 has been the focus of its own first One UI 9 test build spotted for the Z Flip 8 coverage, with SamMobile reporting that the device is internally codenamed H8 and set to launch globally.

What’s Different in One UI 9?

Samsung’s own framing of One UI 9 is restrained. The press release describes the update as delivering expanded creative tools, customization options, a more accessible mobile experience and stronger protection, and stops short of a headline redesign. The phrasing lines up with what SammyGuru calls a focus on refinement, with better readability, smoother animations, cleaner layouts, and a more simplified overall experience, rather than the visual overhaul of recent One UI jumps.

The single named feature outside Samsung’s official list is Tap to Share, which SammyGuru reports will work similarly to Apple’s AirDrop by enabling faster file transfers between compatible Galaxy devices. The Galaxy Z Fold 8 price hike leak from Lanzuk also points to the Z Fold 8 series as the first devices to ship with the full One UI 9 experience, including the new Galaxy AI features Samsung is holding back from the S26 public beta.

Beyond that, internal builds have not yet revealed additional headline features, and Samsung has warned that more changes could still be added or removed before the public beta opens to other devices. The build numbers surfacing on Samsung’s servers (S94xBXXU2ZZEQ for the S26 series, A166BXXU8EZF1 for the A16 5G, and A356BXXUAEZF1 for the A35) all match the early-development firmware pattern Samsung has used for prior One UI cycles.

A Year of Subtle Refinements

One UI 9 is shaping up as a software update built for polish. Samsung’s announcement describes a more intuitive and personalized mobile experience with enhancements across creativity, accessibility and security, and stops there. The company’s own press release frames the change as a refinement cycle, with the heavier visual changes reserved for future updates.

Samsung is in the final stages of One UI 8.5 stable rollout and could wrap it up before the end of this month. At the same time, the company is also quietly working on its next major software update – Android 17-based One UI 9. According to early reports, Samsung could officially debut the stable version around late July.

The unreleased Galaxy Z Fold 8 Ultra, Z Fold 8 Wide, and Z Flip 8 are the three devices that already carry One UI 9 firmware in internal testing, and they are the ones Samsung has tagged to ship with the full One UI 9 experience, including the new Galaxy AI features, later this year. The S26 public beta and the wider internal test build sweep both line up around the same release window.

When Stable One UI 9 Arrives

Samsung has not given a specific stable-release date. The company’s own press release and partner coverage point to the second half of 2026, with the launch tied to its summer foldable hardware. SamMobile reports the public release will likely follow the next-generation foldables launching in the next couple of months.

The summer Galaxy Unpacked event is widely expected on July 22, 2026, with the Galaxy Z Fold 8 Ultra, Z Fold 8 Wide, and Z Flip 8 sharing the stage. SammyGuru’s budget devices piece ties the same July 22 date to the wider One UI 9 unveiling alongside those foldables. Stable One UI 9 would follow from there, with the wider internal test build list pointing to the order in which older Galaxy S, Z, A, and Tab devices get pulled into the rollout.

Samsung’s own announcement confirms that the full One UI 9 experience will be introduced with upcoming Galaxy flagship devices later this year, which will include advanced AI features that will make mobile interaction easy and effortless. Older eligible devices are expected to receive the update in waves during the final months of 2026.

How to Try the Beta Right Now

The public beta is limited to Galaxy S26, S26+, and S26 Ultra owners in six markets: Germany, India, Korea, Poland, the United Kingdom, and the United States. Sign-ups run through the Samsung Members app, and the beta is free to enroll in. Samsung has not yet said when the public beta will open to other devices, though the internal test build list points to the S25, S24, and Z Fold 7 / Z Flip 7 families as the next candidates.

For anyone outside the S26 lineup or those six markets, the realistic timeline is to wait for the stable release later this summer, which will debut on the next-generation foldables and then roll out across the wider lineup. The 28-device test build sweep is the early signal of how that rollout will shape up, even though the public beta gate stays narrow for now.

Frequently Asked Questions

Which Galaxy devices will get One UI 9?

Samsung has not published a full eligible-device list. The public beta is currently limited to the Galaxy S26 series in six markets, and internal test builds now span 28 devices across the S, Z, A, and Tab lines. SamMobile has reported that a wide range of Galaxy devices from across the entire lineup are eligible for the update, with more beta expansion expected in the coming months.

When will stable One UI 9 launch?

Samsung has not announced a specific date for the stable rollout. The company has confirmed the full One UI 9 experience will ship with its upcoming Galaxy flagship devices later this year. SamMobile reports the public release will follow the next-generation foldables, which SammyGuru ties to a July 22, 2026 Galaxy Unpacked event in New York.

How do I join the One UI 9 beta?

Galaxy S26, S26+, or S26 Ultra owners in Germany, India, Korea, Poland, the United Kingdom, or the United States can apply through the Samsung Members app. Enrollment is free, and Samsung has been pushing incremental updates including Beta 2 in the UK and Korea. Beta access has not yet opened for any other Galaxy device.

Is the One UI 9 beta safe to install on a daily driver?

Beta software carries known and unknown bugs. The current One UI 9 Beta 2 changelog lists six fixes, including a GPUWatch interruption popup, a routine app non-functioning issue, a status bar display error, a lock screen clock font issue with LockStar installed, a delay when deleting messages in bulk, and a Game Booster entry point setting error. Installing the beta on a primary phone is at the user’s own risk; a secondary device is the safer choice for testers.

What’s different about One UI 9?

Samsung is positioning One UI 9 as a refinement update rather than a visual overhaul. The confirmed changes in the public beta include new Samsung Notes tools, a Quick Panel with independent brightness, sound, and media controls, a combined TalkBack accessibility package, the Text Spotlight feature, and stronger protection against suspicious apps. The Tap to Share feature, an AirDrop-like file transfer tool, is also expected once the wider beta opens up.