First One UI 8 beta build for the Samsung Galaxy S25 Ultra appears on test servers

The Samsung Galaxy S25, S25+ and S25 Ultra may have launched with One UI 7, but when it comes to One UI 8 they will have to wait for an over-the-air update like all the other Galaxys. This could come sooner than expected, though.

The first One UI 8 beta build for the Galaxy S25 Ultra has been spotted by Tarun Vats. The new firmware is S938BXXU3ZYEA / S938BOXM3ZYEA / S938BXXU3BYEA.

Looking back a generation, the Samsung Galaxy S24 Ultra got a One UI 7 test build back in May 2024. A number of delays pushed the stable rollout to April of this year. That was a major update, however, that significantly reworked the One UI parts of the firmware, not just the base Android OS. One UI 8 will reportedly build on 7 and should be a simpler update.

First One UI 8 beta build for Galaxy S25 Ultra appears on test servers

According to Vats, the first public One UI 8 beta for the Galaxy S25 series will be out in mid-June. How that beta performs will be indicative of how long we will have to wait for a stable release.

A video demo and some screenshots from early One UI 8 builds have already leaked. Below is a fresh video that shows off Samsung's progress in polishing the transition animations in One UI:

Latest One Ui 8 Build ZYEA animations: pic.twitter.com/upzRNpef5b

— IposDev (@DevOfIpos) May 8, 2025

The first phones that will run the new software out of the box will be the Galaxy Z Fold7 and Z Flip7, which are expected in late July or early August.

Interestingly, previous Galaxy foldables have launched with the same major One UI version as that year’s Galaxy S series (just with a minor version update). This suggests that One UI 8 is further along its development than 7 was at the same time last year.

Samsung is already looking ahead too, with leaks suggesting that it’s working on One UI 8.5 for the future Galaxy S26 series.

Source

Samsung Galaxy S25

Samsung Galaxy S25+

Samsung Galaxy S25 Ultra