Samsung has reportedly started internal testing of its upcoming One UI 9.5 software for the Galaxy S26 series. The first beta firmware build has now been spotted, suggesting that development of the next major One UI update is underway.
The spotted firmware carries the following build numbers:
- Galaxy S26 Ultra: S948BXXU6ZZK3
- CSC: S948BOXM6ZZK3
- Modem: S948BXXU6CZK3
One important detail is the bootloader version change. The firmware moves from U5 to U6, indicating a bootloader revision alongside the new software development.
This is an encouraging sign for Galaxy S26 users who are waiting to experience Samsung’s next software improvements.
Although Samsung has not officially announced the One UI 9.5 beta program, the first public beta could arrive by the end of November 2026.
However, this timeline is not confirmed, and Samsung may change its testing schedule. We will share more details as new builds and rollout information emerge.
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