Samsung has begun internal testing of One UI 8.5 for the Galaxy S23 series. The South Korean company identified the firmware S918BXXU9FYJ3 on the Galaxy S23 Ultra, signaling progress in development based on Android 16. This follows the temporary suspension of the One UI 8.0 update, rolled out in early October 2025 for the S23, S23 Plus, and S23 Ultra models.

The move underscores Samsung’s commitment to rapid update cycles for devices launched in 2023. Users of the series are still awaiting the resumption of One UI 8.0 in select regions, but attention now shifts to enhancements in the 8.5 version.

Testing indicates Samsung’s focus on optimizing older hardware for compatibility and performance.

• Initial firmware: S918BXXU9FYJ3 for S23 Ultra.
• Base: Android 16 QPR2, aligned with Google’s schedule.
• Scope: Gradual expansion to S23 and S23 Plus in coming months.

Early firmware signals testing phase

The S918BXXU9FYJ3 firmware appeared on Samsung’s internal servers for the Galaxy S23 Ultra. This preliminary build confirms engineers are integrating One UI 8.5 components into the 2023 flagship.

Mais sobre o assunto: Samsung intensifica avaliações da One UI 9.0 com Android 17 para Galaxy S24 e S23 em servidores internos

The build remains absent from public test servers, suggesting a closed debugging phase. Samsung typically reserves this period for bug fixes before open betas.

Expected features in One UI 8.5

One UI 8.5 will bring visual and functional refinements based on Android 16 QPR2. Interactive wallpapers will feature subtle animations responding to user gestures.

AI tools will expand, including real-time advanced photo editing. eSIM migration will streamline device transfers, reducing manual steps.

Network optimizations aim to extend battery life by up to 10% in mixed usage, per Samsung’s internal benchmarks. The Bixby assistant will see a revamped interface with more intuitive machine-learning-based commands.

Comparison with prior updates

Samsung adjusted its schedule to align with Google’s quarterly updates, skipping minor versions like 8.1. This accelerates feature delivery for flagships like the S23.

Previously, One UI 7 introduced Galaxy AI to the S23 in March 2025. Now, 8.5 focuses on refinement without major design overhauls.

Saiba mais: Samsung expande testes internos da One UI 9.0 com Android 17 para as linhas Galaxy S24 e S23

Users reported stability in the One UI 8.0 beta, with downloads up to 3 GB. The 8.5 version is expected to maintain this balance, enhancing security via an improved Secure Folder.

The One UI 8.0 rollout paused in countries like South Korea and Vietnam, impacting millions of devices. Analysts attribute the delay to final optimizations, but the swift shift to 8.5 highlights Samsung’s efficient software pipeline, processing thousands of code lines daily for cross-device compatibility.

Launch tied to Galaxy S26 series

One UI 8.5 is slated for release in January 2026 alongside the Galaxy S26 series. Samsung plans betas starting November 2025 for S25 and foldables, extending to S23 in the first quarter of 2026.

Mid-range models, like the Galaxy A series, will wait for One UI 9.0 for exclusive features, keeping the focus on flagships during the Android 16 cycle.

Preparation for public beta

Internal testing continues in Samsung’s South Korea labs. Engineers prioritize enhanced DeX integration, supporting 90:10 split-screen ratios for seamless multitasking.

Cobertura completa: EUA

Compatible Galaxy devices

The update targets flagships from 2022 onward, including S23, S24, and S25. Tablets like Tab S9 and foldables like Z Fold 6 are also included.

• Galaxy S23 series: High priority for testing.
• Galaxy Z series: Recent Fold and Flip models.
• Galaxy Tab: S9 and S10 models with 5G support.

Over 50 million global downloads are expected in the first months, based on One UI 8.0 adoption patterns.