Xiaomi 18 Pro Max China OS4.0.27.0.XEOCNXM Update

OS4.0.27.0.XEOCNXM is a stable HyperOS 4 update for the Xiaomi 18 Pro Max (China, codename madrid), based on Android 17 and released on Oct 19, 2026.

• Device Xiaomi 18 Pro Max (madrid)
• Region China
• OS HyperOS 4, Android 17
• Branch Stable

Is this the right ROM for your phone? Paste the version from Settings → About phone to see its region, Android version and whether a newer build exists.

Check

Download OS4.0.27.0.XEOCNXM

What’s New in OS4.0.27.0.XEOCNXM

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 → tap the HyperOS logo 7–10 times → 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 Xiaomi 18 Pro Max firmware page. Installing an older version? Read how to check anti-rollback first; switching region? See ROM region codes.

Other Xiaomi 18 Pro Max China Versions

• Newer: OS4.0.29.0.XEOCNXM (Nov 2, 2026)
• All Xiaomi 18 Pro Max firmware for every region

Build data: official Xiaomi servers. Firmware list tracked by XiaomiFirmwareUpdater.