Tech Insights

December 15, 2025, 5:22 AM EST. Samsung has begun rolling out One UI 8 Watch to the aging Galaxy Watch 4, widely expected to be its last major OS update. The rollout started in South Korea with builds R87OXXU1JYK4/R870OXM1JYK4 and is likely to expand to the US soon. The watch debuted in 2021, and Samsung promised four years of major OS updates for Wear OS and One UI Watch, making this release the final platform upgrade for Samsung's first Wear OS watches. While One UI 8 Watch on Wear OS 6 may not bring every feature seen on newer devices, it should deliver meaningful refinements, under-the-hood improvements, and ongoing security patches.