GoKawiilOne UI 9.5 beta firmware spotted for Galaxy S26 Ultra ahead of rollout
A One UI 9.5 beta build, firmware S948BXXU6ZZK3, has appeared on Samsung's Korean and US update servers for the Galaxy S26 Ultra, a step that usually precedes open registration. Samsung hasn't confirmed a date, but its prior point-five update opened testing on December 8, 2025. Enrollment, once live, will go through the Samsung Members app and will likely be limited to six countries: Germany, India, Poland, South Korea, the UK and the US.