Overview
- Samsung’s support and firmware pages list stable One UI 9 builds (S94xUSQU4BZID) for the Galaxy S26, S26 Plus, and S26 Ultra on T‑Mobile, Metro by T‑Mobile, and US Cellular and include the September 5, 2026 security patch.
- Reporters and early users are seeing unlocked S26 units begin to receive the update, but Samsung is distributing the upgrade in staged waves that vary by carrier and region.
- The official changelog highlights new Galaxy AI tools, Samsung Health updates, stronger privacy controls, Bixby improvements, accessibility refinements, and DeX feature upgrades.
- Some advanced on‑device AI features will be blocked on phones that lack roughly 12GB of RAM or compatible chipsets, so midrange and older Galaxy models may only get the UI, camera, and security changes.
- The stable package is a large download and will require carrier approvals in many markets, so users should expect staggered availability, possible manual firmware installs, and continued beta backports of select S26 and Fold 8 features to older models.