Samsung Leaks Galaxy S25 Ultra One UI 9 Beta Build, Verified on Servers

Q: Will Samsung's leaked One UI 9 beta for the Galaxy S25 secretly upgrade the device to Android 17, or is there a catch?

No. The leaked One UI 9 beta for the Galaxy S25 is not a secret jump to Android 17 based on the leak itself. The catch is that the leaked firmware is an internal, encrypted test build that cannot be installed, and Samsung has not officially said the S25 beta is live yet. What the leak does show is that Samsung is preparing a real One UI 9 build for the Galaxy S25 Ultra. The build number S938NKSU3DZG8 was reportedly verified on Samsung’s servers, which strongly suggests it is genuine. That is a reliable sign that public beta testing is close. The confusion comes from Samsung’s broader rollout. One UI 9 has now debuted on the Galaxy Z Fold 8 and Z Flip 8 with Android 17 preinstalled, and Samsung is also running Android 17-based One UI 9 betas on the Galaxy S26 series. So One UI 9 as a platform is tied to Android 17 on current shipping and beta devices. For the Galaxy S25, however, the leak alone does not prove users are getting an immediate public Android 17 upgrade today. It points to Samsung nearing a beta release, likely within days or weeks if the company follows its usual pattern. Until Samsung opens registrations in Samsung Members or announces the program, this remains a preparatory internal build, not a usable update. So the likely answer is that the S25 beta is heading toward Android 17-based One UI 9, but the “catch” is that the leaked file itself is only evidence of testing, not a secret public upgrade.

3 articles · Updated · tech-ish.com · Jul 23

Build S938NKSUBDZG8 surfaced as what appears to be the first One UI 9 beta firmware for the Galaxy S25 Ultra, and its presence on Samsung servers points to a genuine internal release.
Server verification matters because the firmware remains encrypted and inaccessible, making the listing itself one of the clearest signs that development has advanced from internal testing toward public beta readiness.
CZG3 is the current Android 16-based S25 build, so the newly spotted package suggests Samsung has moved to a newer beta-stage branch for the flagship lineup.
June internal testing had already hinted Samsung was accelerating One UI 9 work, and the stable software's debut on the Galaxy Z Fold 8 and Z Flip 8 makes the S25 series the next likely beta target.
Samsung still has not announced a beta date, but the leak suggests registrations could open within days or weeks before a broader rollout to older Galaxy devices.