Samsung has begun internal development of One UI 9.5 — and firmware build S938BXXUDEZKG has already appeared on its servers, tagged for the Galaxy S25 Ultra. That’s the only confirmed detail. No features, no timeline, no rollout plan. Just a build number, a device name, and the quiet start of what will likely be a stopgap update before One UI 10 arrives next year.
It’s not even clear whether this build is meant for testing or just early staging. Samsung hasn’t announced One UI 9.5. It hasn’t confirmed the Galaxy S25 series exists yet, though the S25 Ultra designation in the firmware strongly implies it does. The build surfaced one day after Android Headlines reported the development, citing tipster Fahad Ali Javed.
Ice Universe, another widely followed Samsung leaker, has separately suggested One UI 9.5 will be minor, a “tuning” release while Samsung pours resources into One UI 10, which he calls the company’s “historically biggest” software overhaul. That tracks with Samsung’s recent rhythm: One UI 8.5 and 9.5 were both incremental, focused on polish and pre-launch prep for the next major version.
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