Samsung prepares its next major software update as early Galaxy S26 test builds emerge

Samsung has begun testing early One UI 9.5 builds on internal servers for the Galaxy S26 series, according to social media leaks cited by Android Authority and Android Central. Tipster Kailash spotted test firmware versions S948BXXU6ZZK3, S948BOXM6ZZK3, and S948BXXU6CZK3, which also appeared in findings from tipster Tarun Vats. The discoveries have prompted speculation among observers that an official beta program could launch as early as late November. [1][2]

The test versions reveal that Samsung has updated the bootloader for the Galaxy S26 lineup from U5 to U6. The software is also rumored to bring back App Lock, allowing owners to protect specific applications using passwords, biometrics, or alternative verification checks. [1][2]

The movement on test servers follows earlier sightings in August of Samsung testing the update for the Galaxy S27 Ultra. Even if a public beta program opens soon, industry observers note that One UI 9.5 is not expected to see an official release until April or May 2027. [1][2]