Overview
- The stable One UI 9 release for the Galaxy S23, S23+ and S23 Ultra plus the Galaxy Z Fold5 and Z Flip5 began rolling in South Korea for beta participants on Thursday and is being widened to non-beta users and other markets.
- The October 2026 security update bundled with One UI 9 fixes 62 known issues and the official changelog confirms a patch for a bug that caused phones to reboot repeatedly after upgrades.
- Mid-range A-series models are receiving mixed treatment: the Galaxy A15 5G got a third One UI 9 beta with the October patch, the Galaxy A54 received the security update and opened a beta program, and the Galaxy A37 unexpectedly saw a stable One UI 9 build in South Korea.
- Update logistics vary by device and enrollment: beta users in Korea get smaller delta downloads under ~500MB while non-beta stable packages can run about 3GB, and carriers or regional approvals will affect timing and package sizes.
- Core One UI 9 changes include Quick Panel customization, DeX and Notes improvements, accessibility tweaks and deeper Gemini integration, though advanced on-device Galaxy AI features remain limited to newer chips and higher‑RAM models.