Samsung has started rolling out a new October 2026 security and stability update for the Galaxy S25 series in the United States. The latest release is available for both carrier-locked and unlocked devices, following the One UI 9 upgrade. The Galaxy S25 Ultra unlocked variant receives firmware version S938U1UEUDDZJB, while the locked variant gets S938USQUDDZJB. The standard Galaxy S25 also receives a new update with firmware version S931U1UEUDDZJB.
The update package weighs approximately 705.87 MB for the Galaxy S25 Ultra and 704.09 MB for the Galaxy S25. It includes the October 5, 2026 security patch, addressing security vulnerabilities identified in Google’s and Samsung’s October security maintenance release.
Samsung’s update focuses on security improvements rather than introducing new features. US users can check availability through Settings > Software update > Download and install. The rollout may vary depending on the device variant and carrier.
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