Xiaomi 12S China OS3.0.3.0.VLTCNXM Update

OS3.0.3.0.VLTCNXM is a stable HyperOS 3 update for the Xiaomi 12S (China, codename mayfly), based on Android 15 and released on Mar 23, 2026.

• Device Xiaomi 12S (mayfly)
• Region China
• OS HyperOS 3, Android 15
• 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 OS3.0.3.0.VLTCNXM

What’s New in OS3.0.3.0.VLTCNXM

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 12S firmware page. Installing an older version? Read how to check anti-rollback first; switching region? See ROM region codes.

Other Xiaomi 12S China Versions

• Older: OS1.0.24.1.8.DEV (Jan 12, 2024)
• All Xiaomi 12S firmware for every region

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