If you own a Galaxy S25, the biggest software upgrade of its life is now on its way. Samsung has started pushing the stable One UI 9 update — built on Android 17 — to the Galaxy S25, S25+, and S25 Ultra, beginning in South Korea. If history is any guide, the US is about a week behind.
GSMArena reports that Korean S25 owners — including those who never joined the beta program — started receiving the stable build on September 28, exactly on the schedule Samsung’s Thailand newsroom had promised.
How to Tell You’ve Got the Real Thing
With beta builds floating around for weeks, here’s how to confirm you’re on the finished release. The stable build for the core S25 trio carries firmware version S93xNKSUCDZIF. If you’re jumping straight from One UI 8.5, expect a hefty ~3.9GB download; beta testers get a much smaller ~500MB delta. Either way, your update screen should show the September 5, 2026 security patch — and a notice that the One UI 9 beta program has ended.
The rollout doesn’t stop at the core trio. According to GSMArena, the Galaxy S25 Edge and S25 FE are getting the stable build too, and Galaxy Z Fold7 and Z Flip7 owners on the beta are now seeing their stable updates land — with non-beta foldable owners to follow.
When the US Gets It
Samsung hasn’t published a US date, but the pattern is right there in the open. The Galaxy S26 series got One UI 9 in Korea on September 16 and in the US exactly one week later, on September 23. The S25 rollout began in Korea on September 28 — which points to US notifications landing sometime next week. As always with Samsung, timing varies by carrier and model, so don’t panic if your neighbor’s phone updates first.
To check manually: Settings → Software update → Download and install.
What Actually Changes
One UI 9 is a bigger deal than the version number suggests, because the betas quietly loaded the S25 with Galaxy AI features that debuted on newer hardware. The headline additions: Call Brief (AI summaries of your calls), Custom Cards in Now Brief, Now Nudge (proactive suggestions), and My FanCam. The first beta also brought a more customizable Quick Panel, Samsung DeX improvements, a Tape feature in Samsung Notes, a location-access indicator for privacy, and Pay Now in Now Brief.
Under the hood it’s Android 17, which means the usual platform-level gains in performance, battery efficiency, and notification handling — plus whatever Samsung’s skin adds on top.
Why this matters
Here’s what the commodity coverage misses: this rollout is Samsung keeping an unusually aggressive promise. A full Android version upgrade landing on last year’s flagships within weeks of the new S26 series — on the exact date a regional newsroom announced — is the kind of software support that used to be Pixel-exclusive territory. For S25 owners, the practical takeaway is simple: the phone you already own is about to feel meaningfully newer, with AI features Samsung previously reserved for its latest hardware. Check your build number, make sure you’re on Wi-Fi for that 3.9GB download, and don’t install a random “One UI 9” file from a forum — the stable build is S93xNKSUCDZIF, and anything else isn’t it.
Meanwhile in Mobiles: Motorola’s Signature 27 picked up GrapheneOS support — the privacy crowd’s new favorite flagship. And what to know about the Pixel’s September update lock-screen bug.
