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Redmi K40S
HyperOS 1.0StableChina

Redmi K40S HyperOS 1.0 OS1.0.15.0.ULMCNXM

Stable firmware for the China Redmi K40S (munch), released March 24, 2026.

Download OS1.0.15.0.ULMCNXM

Recovery ROM (OTA .zip) · 5.4 GB Install from the phone’s updater app — keeps your data.
MD5: 945b97531490db7e212a0817bff32422
Download
Fastboot ROM (.tgz) · 6.2 GB Full image for Mi Flash Tool — clean install, unbrick or downgrade.
MD5: 2f6342532f8800153457149a77bf82fe
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
Redmi K40S
Codename
munch
Region
China
Version
OS1.0.15.0.ULMCNXM
OS
HyperOS 1.0
Android
14.0
Branch
Stable
Released
Mar 24, 2026
Package
Recovery 5.4 GB / Fastboot 6.2 GB

How to install OS1.0.15.0.ULMCNXM

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 Redmi K40S.
  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 Redmi K40S (China) builds

Device page →
DeviceVersionAndroidBranchReleased
Redmi K40SChina · munchV14.0.23.9.18.DEV
MIUI 14Public Beta
13.0Public Beta
Redmi K40SChina · munchV14.0.22.12.5.DEV
MIUI 14Public Beta
13.0Public Beta

Redmi K40S firmware for other regions

Frequently asked questions

Is OS1.0.15.0.ULMCNXM an official Redmi K40S update?
Yes. OS1.0.15.0.ULMCNXM is an official Stable HyperOS 1.0 build for the Redmi K40S (China), released by Xiaomi on March 24, 2026. The download links point directly to Xiaomi’s update servers.
Which Android version does OS1.0.15.0.ULMCNXM use?
This firmware is based on Android 14.0.
Will installing OS1.0.15.0.ULMCNXM 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 (munch). Cross-region flashing requires an unlocked bootloader and can cause problems.