OS4.0.5.0.XPMCNXM is a stable HyperOS 4 update for the Redmi K90 Pro Max / POCO F8 Ultra (China, codename myron), based on Android 17 and released on Oct 23, 2026. It brings the October 2026 Android security patch.
- Device Redmi K90 Pro Max / POCO F8 Ultra (
myron) - Region China
- OS HyperOS 4, Android 17
- Branch Stable
- Security patch 2026-10-01
- Build date Oct 20, 2026
- Fingerprint
Redmi/myron/myron:17/CP2A.260605.016/17OS4.0.261020.223031081.QCPECN.S:user/release-keys
Download OS4.0.5.0.XPMCNXM
| Type | Size | MD5 | |
|---|---|---|---|
| Recovery ROM (.zip, built-in updater) | 10.2 GB | — | Download |
| Fastboot ROM (.tgz, Mi Flash) | 13.2 GB | — | Download |
What’s New in OS4.0.5.0.XPMCNXM
Xiaomi hasn’t published release notes for this build. Updates like this usually contain bug fixes, stability improvements and, if listed above, a new security patch.
How to Install This Update
Download the Recovery ROM, move it to the internal storage and choose Settings → About phone → (tap the OS card) → three dots → Choose update package. This keeps your data, but only works for a China phone on an older version. For a clean install or a region change, flash the Fastboot ROM with Mi Flash (unlocked bootloader required). Step-by-step instructions are on the Redmi K90 Pro Max / POCO F8 Ultra firmware page.
Other Redmi K90 Pro Max / POCO F8 Ultra China Versions
- Older: OS3.0.4.0.WPMCNXM (Oct 23, 2025)
- All Redmi K90 Pro Max / POCO F8 Ultra firmware for every region
Build data: official Xiaomi servers. Firmware list tracked by XiaomiFirmwareUpdater.