Xiaomi 18 Pro Max China OS4.0.29.0.XEOCNXM Update

OS4.0.29.0.XEOCNXM is a pilot (staged rollout) HyperOS 4 update for the Xiaomi 18 Pro Max (China, codename madrid), based on Android 17 and released on Nov 2, 2026.

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

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.

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Download OS4.0.29.0.XEOCNXM

What’s New in OS4.0.29.0.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. This is a Pilot build: phones outside the pilot group often refuse it with “Installation of this software version is prohibited”, so you may have to wait for the stable release. 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

• Older: OS4.0.27.0.XEOCNXM (Oct 19, 2026)
• All Xiaomi 18 Pro Max firmware for every region

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