Samsung Galaxy S25 Series Receives One UI 8.5 Fourth Beta Update: What’s New?

Samsung has officially commenced the rollout of the fourth beta version of One UI 8.5 for its latest flagship lineup, including the Galaxy S25, Galaxy S25+, and the Galaxy S25 Ultra. While initial industry reports suggested that this specific update would land in mid-January 2026, the software has arrived slightly later than anticipated, appearing just over a month after the previous beta iteration. This release marks a significant step toward the final stable version of the operating system.

Details of the One UI 8.5 Beta 4 Rollout

The One UI 8.5 Beta 4 update is currently being distributed in Samsung's home market, South Korea. It is expected that the company will expand the availability of this firmware to other participating countries in the beta program later today. Clocking in at a substantial 1.5GB, the update carries a firmware version ending in ZZAL, indicating a significant number of under-the-hood improvements, stability fixes, and potentially new feature refinements based on user feedback from earlier versions.

How to Download the One UI 8.5 Beta 4 Update

If you are currently enrolled in the One UI 8.5 Beta Program, you can check for the update manually. Navigate to Settings, select Software update, and tap on Download and install. It is important to remember that this firmware is exclusively available to users who have registered their compatible Galaxy S25 devices through the Samsung Members app. As with all beta software, it is recommended to back up your data before proceeding with the installation.

Looking ahead, Samsung is expected to transition from the beta phase to a stable release very soon. The final version of One UI 8.5 is projected to roll out to the public shortly after the official unveiling of the Galaxy S26 series, which is scheduled for later this month. For a deeper look at the performance and features of the new software, you can view the detailed review in the video below.

Which Galaxy devices can install the One UI 8.5 Beta 4 update?

Currently, the update is available for the Galaxy S25, Galaxy S25+, and the Galaxy S25 Ultra. Users must be actively enrolled in the Samsung Beta Program to receive this specific firmware.

Where has the update been released so far?

The rollout has officially started in South Korea. It is expected to reach other regions like the United States, Germany, and India within the next 24 hours.

What is the size of the Beta 4 update?

The update is approximately 1.5GB in size. Due to its large volume, it is recommended to download the update over a stable Wi-Fi connection.

When will the stable version of One UI 8.5 be available for everyone?

While Samsung has not given an exact date, the stable version is widely expected to launch alongside or shortly after the Galaxy S26 series debut later this month.

🔎 The release of the fourth beta for One UI 8.5 indicates that Samsung is in the final stages of polishing its latest software experience. While the update arrived slightly later than the rumors suggested, the substantial file size points toward a significant effort to eliminate bugs and optimize performance. For Galaxy S25 owners, this update brings them one step closer to a refined, stable Android 16-based experience that will define the Samsung ecosystem for the coming year.