Xiaomi 18 Fold China OS4.0.21.0.XPNCNXM Update

OS4.0.21.0.XPNCNXM is a stable HyperOS 4 update for the Xiaomi 18 Fold (China, codename lhasa), based on Android 17 and released on Sep 26, 2026.

• Device Xiaomi 18 Fold (lhasa)
• 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.

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Download OS4.0.21.0.XPNCNXM

What’s New in OS4.0.21.0.XPNCNXM

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 Fold firmware page. Installing an older version? Read how to check anti-rollback first; switching region? See ROM region codes.

Other Xiaomi 18 Fold China Versions

• Newer: OS4.0.26.0.XPNCNXM (Oct 19, 2026)
• All Xiaomi 18 Fold firmware for every region

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