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Xiaomi 12S
HyperOS 3.0StableChina

Xiaomi 12S HyperOS 3.0 OS3.0.3.0.VLTCNXM

Stable firmware for the China Xiaomi 12S (mayfly), released March 23, 2026.

Download OS3.0.3.0.VLTCNXM

Recovery ROM (OTA .zip) · 6.3 GB Install from the phone’s updater app — keeps your data.
MD5: 16f6dcd3383d20ccae404262cdd14340
Download
Fastboot ROM (.tgz) · 7.6 GB Full image for Mi Flash Tool — clean install, unbrick or downgrade.
MD5: ab4953c4247f747e9168ea13d065d0e7
Download

Files are served from Xiaomi’s official servers. Compare the MD5 checksum after downloading to make sure the file is complete and untouched.

Firmware details

Device
Xiaomi 12S
Codename
mayfly
Region
China
Version
OS3.0.3.0.VLTCNXM
OS
HyperOS 3.0
Android
15.0
Branch
Stable
Released
Mar 23, 2026
Package
Recovery 6.3 GB / Fastboot 7.6 GB

How to install OS3.0.3.0.VLTCNXM

Recovery ROM (recommended, keeps data)

  1. Back up your important data and charge the phone to at least 50%.
  2. Download the Recovery ROM above on your Xiaomi 12S.
  3. Open Settings → About phone and tap the HyperOS version card.
  4. Tap the ⋮ menu → Choose update package and select the downloaded .zip file.
  5. Wait for verification, then tap Reboot now. The update takes 10–20 minutes.

Fastboot ROM (clean install, needs unlocked bootloader)

  1. Make sure the bootloader is unlocked and install Mi Flash Tool plus the Xiaomi USB drivers on a Windows PC.
  2. Download and extract the Fastboot ROM (.tgz) to a short path such as C:\rom.
  3. Power off the phone, hold Volume Down + Power to enter Fastboot mode and connect it via USB.
  4. In Mi Flash Tool select the extracted folder, choose clean all (wipes data) and avoid “clean all and lock” unless you want to relock.
  5. Click Flash and wait until the tool shows success; the phone reboots automatically.

Other Xiaomi 12S (China) builds

Device page →
DeviceVersionAndroidBranchReleased
Xiaomi 12SChina · mayflyOS1.0.24.1.8.DEV
HyperOS 1.0Public Beta
14.0Public Beta
Xiaomi 12SChina · mayflyV14.0.4.0.TLTCNXM
MIUI 14Stable Beta
13.0Stable Beta
Xiaomi 12SChina · mayflyV14.0.22.12.5.DEV
MIUI 14Public Beta
13.0Public Beta

Frequently asked questions

Is OS3.0.3.0.VLTCNXM an official Xiaomi 12S update?
Yes. OS3.0.3.0.VLTCNXM is an official Stable HyperOS 3.0 build for the Xiaomi 12S (China), released by Xiaomi on March 23, 2026. The download links point directly to Xiaomi’s update servers.
Which Android version does OS3.0.3.0.VLTCNXM use?
This firmware is based on Android 15.0.
Will installing OS3.0.3.0.VLTCNXM erase my data?
Installing the Recovery package through the updater app keeps your apps and data. Flashing the Fastboot package with “clean all” wipes the phone — back up first.
Can I install this on another region’s device?
Only install firmware that matches your device’s region (China) and codename (mayfly). Cross-region flashing requires an unlocked bootloader and can cause problems.