One UI 8.5 for the Galaxy S25 Ultra appears on Samsung's server

Samsung released the stable One UI 8 update for the Galaxy S25 series earlier this week, and while it's still in the process of expanding the One UI 8 rollout to all regions, a One UI 8.5 internal test build for the Galaxy S25 Ultra has appeared on Samsung's server, suggesting the brand is already working on the development of the next One UI 8 version for its 2025 flagship.

The One UI 8.5 build for the Samsung Galaxy S25 Ultra has firmware version S938BXXU5CYIA/S938BOXM5CYIA/S938BXXU5CYIA, but it can't be downloaded since Samsung fixed a loophole that allowed people to download under-development One UI firmware on their Galaxy devices.

That said, Samsung has also been working on One UI 8.5 for next year's Galaxy S26 series, and chances are the Galaxy S25 series and older models will get One UI 8.5 stable update only after the launch of the Galaxy S26 lineup.

Samsung Galaxy S25 Ultra

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