Samsung Starts One UI 9 Development on Galaxy S26 Ultra

Samsung has begun early development on One UI 9, its upcoming software skin based on Android 17, with the first test build appearing on the Galaxy S26 Ultra smartphone. The firmware, version S948BXXU1BZC5 for the global model, was spotted on the company's servers and successfully installed on a device, marking an initial milestone in the update's creation.

Reports indicate that the 2.6GB build, based on Android 17 Beta 2, shows limited visible changes at this stage. Quick settings now feature larger volume and brightness controls, and parental controls have gained a dedicated section in the settings menu. As development advances, further enhancements are anticipated, drawing from Android 17's features such as improved app windowing for multitasking, support for lock screen widgets, and better adaptability for applications across various screen sizes. Android 17 also introduces split panels reminiscent of iOS, allowing users to access notifications by swiping down from the top left corner and quick settings from the top right.

This early testing aligns with Samsung's established timeline for major updates. The Galaxy S26 series, unveiled in late February 2026, launched with One...