In other words, it could take a few more days before Xiaomi offers HyperOS 3 to more Xiaomi 15 owners. As the screenshot below shows, HyperOS 3.0.4.0.WOCEUXM contains the October 1 2025 set of Android security patches. Please see the corresponding Android Security Bulletin for full details about the security issues these patches resolve.
As for HyperOS 3.0.4.0.WOCEUXM, GSMArena notes that the update is around an 8.2 GB download. More details about Xiaomi’s latest major OS update can be found in our original HyperOS 3 launch article. Also, the company has already revealed its full HyperOS 3 global rollout schedule, a copy of which we have embedded below.