Samsung has taken a decisive step to ensure the stability of its upcoming operating system by replacing the fourth beta version of One UI 8.5, intended for the Galaxy S25 line. The compilation, identified as ZZAB, was removed from the company’s servers before it was even released to testers, after instabilities were detected that could compromise the user experience. The action demonstrates the manufacturer’s commitment to refining the software before its large-scale distribution.
In its place, a new build, named ZZAD, was compiled and is already on internal servers for testing. Esta version not only fixes the issues identified in the previous one, but also reintroduces features that had been temporarily suspended, signaling a careful advancement in the development schedule. The change of route was noticed by attentive users who monitor the company’s distribution channels.
Expectations for the update were high among beta program participants, who were awaiting release on the scheduled date. The decision to postpone and replace the build reflects a rigorous quality control strategy, prioritizing the delivery of a cohesive and functional system, even in its experimental phase, for the Galaxy S25, S25 Plus and S25 Ultra models.
Hey Galaxy S25 Fam 👀
A new beta build (ZZAD) has been spotted on the test server.
Also, the link and changelog for Beta 4 build (ZZAB) have been removed, which suggests a new build may arrive as Beta 4.
Hopefully, it drops this weekpic.twitter.com/4SghxocYOs
—Tarun Vats (@tarunvats33)January 20, 2026
Details about the new ZZAD compilation
The discovery of the ZZAD build on the Samsung servers was made by brand enthusiasts who follow the One UI development cycle. The direct replacement of the ZZAB version, which was ready for distribution, indicates that the issues found were considered critical enough to warrant a complete new build rather than a simple corrective patch. The quick removal of the leaked changelog from the previous version reinforces the hypothesis that the company acted proactively to prevent the spread of software with potential flaws. The new version is designed to be a more solid foundation for future beta updates, integrating system-level fixes that aim to improve the overall performance and reliability of the S25 series devices. Esse meticulous process is essential to ensure that the final version of One UI 8.5, which will be officially released with the Galaxy S26 line, reaches the highest quality standards expected by consumers.
Changes confirmed in the new version
The ZZAD build reintroduces the Direct Voicemail feature, a feature that allows users to access voice messages directly, without needing to call voicemail. Esse feature had been removed in the previous build, probably for adjustments, and its return indicates that the tests have progressed positively. The functionality aims to optimize communication and simplify an everyday task for millions of users.
Furthermore, the update brings important corrections to the Telefone application, focusing on resolving instabilities that could affect making and receiving calls. Melhorias in connectivity via Bluetooth are also included, addressing issues reported when calling with headphones and other wireless devices. Esses refinements are essential for the daily usability of smartphones.
The importance of the kernel in stability
One of the most relevant technical points of the ZZAD build is the maintenance of the Linux kernel in version 6.6.98. Essa version had been changed in the ZZAB build, which may have been the cause of some of the instabilities detected. Restoring to a previously tested and proven stable version ensures compatibility with performance and security optimizations that were introduced in previous betas, providing a solid foundation for the operating system.
Separate beta program context
The testing program for One UI 8.5 operates completely independently of the monthly security updates. Samsung has started this evaluation phase to collect feedback on new features and ensure the interface is polished before the official launch. The process, although not widely requested by users, is progressing consistently.
Participation is restricted to owners of the Galaxy S25, S25 Plus and S25 Ultra models in select regions. Cada build undergoes rigorous internal evaluation before being sent to testers’ devices via over-the-air (OTA) update.
This approach allows the company to quickly identify and fix bugs, using real usage data from thousands of volunteers to refine the software. The feedback collected is crucial for prioritizing adjustments and improvements that directly impact the end user experience.
Delay and community expectations
The absence of the release of the fourth beta on the expected date generated speculation among users registered in the program. The enthusiast community, which actively monitors the Samsung servers, quickly noticed the removal of the ZZAB build links and patch notes, confirming that a last-minute tweak was in progress.
Samsung’s preventive action was seen positively, as it avoids the distribution of a version that could cause problems on testers’ devices. Transparency in the process, even if indirect, helps maintain users’ trust in the development program.
Internal testing with the new ZZAD build continues apace. Caso new adjustments are necessary, the build number can be changed again, following the company’s standard software development protocol.
Additional features in testing phase
The new ZZAD build is not limited to bug fixes, it also incorporates improvements in artificial intelligence-based features. The AI Select feature, which enables intelligent selections of text and images, has received optimizations to increase its accuracy. The Bixby voice assistant has also been improved, with improvements in understanding commands in natural language, making interaction more fluid and intuitive.
The full restore of the 6.6.98 kernel is a cornerstone of overall good performance, while the reintroduction of Direct Voicemail simplifies access to voice messages. The update also focuses on fixes to the Telefone app for more stable calls and adjustments to Bluetooth connectivity, especially during calls.
Other features, such as Now Nudge, which offers contextual reminders, are also in advanced testing phases within this new build. Além Furthermore, Samsung works to ensure the compatibility of Good Lock modules, such as Home Up, allowing an even greater level of interface customization.
These continuous improvements to the camera, general performance and software tools demonstrate Samsung’s effort to deliver a robust operating system full of useful features, consolidating One UI 8.5 as a significant evolution over its previous versions.
Official release schedule
Samsung plans to officially introduce One UI 8.5 in conjunction with the launch of the Galaxy S26 series, scheduled for the first quarter of 2026. The stable version of the system is expected to begin rolling out to new devices shortly after the announcement, with a broader release occurring in the following weeks.
After updating the latest models, the company will follow a schedule to bring One UI 8.5 to previous generation devices, prioritizing flagships and, later, expanding to mid-range lines. The current beta program, focused exclusively on the Galaxy S25 line, is a crucial step to ensure that this transition occurs smoothly and without major problems for the brand’s millions of users around the world.
