A beta build of One UI 9.5 for the Galaxy S26 Ultra has surfaced on Samsung's servers, according to SamMobile, citing firmware tracker Kailash (@Kailash0729). This information is classified as REPORTED, not as an official announcement: Samsung has not announced the One UI 9.5 beta program.
The global variant carries version S948BXXU6ZZK3, while the Korean model appears as S948NKSU6ZZK3. The letter “Z” in the fourth position from the end marks it as a beta or test build, and the numbering also points to a bootloader upgrade, from U5 to U6.
What this signals — and what is still unconfirmed
According to SamMobile, the build's appearance suggests Samsung could open beta registrations soon. Estimates differ: SamMobile expects the program to go live later this month or early next month, while SammyFans points to mid-December, with a possible slip to late December or January. None of these dates has been confirmed by Samsung.
The update is based on Android 17 and, according to SamMobile, its stable version could debut on the Galaxy S27 series early next year, with the Galaxy S26 series among the first to receive it afterwards. Features, eligible countries and the full device list have not been disclosed.
A firmware build appearing on a test server is a sign of development, not a date guarantee: beta programs can slip as internal testing progresses.
Image credit: SamMobile (Galaxy S26 Ultra photo).
Sources: SamMobile; Android Headlines; SammyGuru
Transparency note: this article was produced with the help of artificial intelligence, based on public posts and sources from the internet. Check the information in the original sources linked above.
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