One UI 8.5 Beta 4 Changelog Reveals Galaxy S25 Bug Fixes and Bixby Improvements

Samsung's ongoing refinement of One UI continues with new details emerging about the upcoming Beta 4 release for Galaxy S25 devices. According to leaked information, the One UI 8.5 Beta 4 update carries firmware version ZZAB and includes several notable fixes alongside improvements to Bixby functionality.

The changelog, shared by reliable sources, confirms Samsung is addressing specific pain points reported by Galaxy S25 users. Key fixes target the Phone application's search history functionality, resolving an issue where recent searches weren't displaying properly. Another correction improves the behavior when pasting phone numbers into the dialer keypad, addressing input recognition problems that previously caused frustration.

Bixby receives attention in this build, aligning with earlier reports of Samsung enhancing its voice assistant capabilities. While specifics about Bixby's changes remain limited in the changelog, these updates likely build upon Samsung's broader initiative to integrate more advanced AI features throughout One UI. The update also resolves a bug affecting the AI Select tool, which identifies objects and text in images for quick actions.

Separately, firmware version ZZAD—reportedly in testing—introduces Direct Voicemail functionality. This feature allows visual voicemail management directly within the Phone app without requiring carrier-specific applications, streamlining message access for compatible carriers. Samsung typically staggers feature rollouts across beta builds, suggesting Direct Voicemail might appear in a later public release even if not included in Beta 4.

This update continues Samsung's rapid iteration cycle for One UI 8.5, which launched in beta earlier this year. User feedback from Galaxy S25 owners indicates satisfaction with One UI 8.0's stability, positioning 8.5 as an incremental refinement rather than an overhaul. The company maintains an aggressive update schedule, with Beta 4 expected to reach testers imminently before broader deployment.

Samsung's approach demonstrates its commitment to addressing specific user-reported issues between major Android version updates. The focus on core application stability—particularly in communication tools like the Phone app—complements broader ecosystem enhancements like Bixby's evolution. As One UI 8.5 progresses through testing, these refinements lay groundwork for the software's eventual rollout to older Galaxy devices following the Galaxy S26 series launch.