Flash Android 6.0.1 Marshmallow KII-L21C185B301 Firmware on Huawei Honor 5X

Android 6.0.1 Marshmallow OS has been finally released by Huawei officially for the Honor 5X smartphone. This latest Android OS update came with KII-L21C185B301 firmware build which is now available through OTA (over-the-air). You might receive the Android M notification on your device but if for some reasons, you can’t manage to receive this new OTA then don’t worry you can still update Huawei Honor 5X with Android 6.0.1 Marshmallow KII-L21C185B301 firmware manually. This is an easy process that will take a few minutes. All you need to download the Android 6.0.1 Marshmallow KII-L21C185B301 build from the given link and follow the given instructions to taste the stable and smooth Android M experience on your phone. The software is pre-loaded with important stability improvements, bug fixes, and security patches so you won’t risk in using a system that isn’t properly optimized, also you will also get Marshmallow goodies through which to customize and personalize the UI that powers your Huawei Honor 5X with the stock features.

Flash Android 6.0.1 Marshmallow KII-L21C185B301 Firmware on Huawei Honor 5X 1

Honor 5X came with Qualcomm MSM8939v2 Snapdragon 616 Chipset, Quad-core 1.2 GHz Cortex-A53 & Quad-core 1.5 GHz Cortex-A53 CPU, 2GB RAM, 15MP Camera, 1080 x 1920 pixels resolution and Android OS, v5.1.1 (Lollipop), planned upgrade to v6.0 (Marshmallow) out of the box.


You can use this guide for all the Huawei Honor 5X. Verify the device’s model by navigating to Settings > About Phone.

Things To Remember:

Warning: UnlockRoot will not be held responsible for any kind of damage occurred to your Huawei Honor 5X during or after the installation of KII-L21C185B301 Android 6.0.1 Marshmallow. Proceed at your own risk.

Data Backup: Take a full backup of all your important data and settings like contacts, pictures, videos, music before proceeding to the rooting instructions.

The Android 6.0.1 OTA build KII-L21C185B301 system can be flashed only if your Honor 5X is already running on stock Android OS.

Enable USB debugging option on your device: Settings > Development Options > USB debugging.

Note:- If you can’t find Developer Options on your phone, then go to Settings > About Phone and tap 7 times on the Build Number. Go back to Settings and there you will see the Developer Options. Now you can enable USB Debugging.

If your Huawei Honor 5X is rooted, then after installing this update the root access will be lost.

Make sure that the battery level of your Huawei Honor 5X should be at least about 60-70 charged to avoid unexpected shutdowns during the rooting process.

Download Files

  1. Download the KII-L21C185B301 Android 6.0.1 Marshmallow for Huawei Honor 5X

Steps to Flash Android 6.0.1 Marshmallow KII-L21C185B301 Firmware on Huawei Honor 5X:

Step No 1:- First, download the KII-L21C185B301 Android 6.0.1 Marshmallow for Huawei Honor 5X .zip file from the above link on the desktop of your PC.

Step No 2:- Turn OFF the Huawei Honor 5X.

Step No 3:- Using a file manager app, create a new folder on your device and name it “dload”.

Step No 4:- Connect your Huawei Honor 5X with the PC using its USB data cable.

Step No 5:- Copy/Paste the downloaded Marshmallow update file in the dload folder on your Honor 5X.

Step No 6:- Disconnect the device navigate to “Menu – Settings – Update – Local Update” on 5X.

Step No 7:- Choose the firmware zipped file that you have already transferred to “dload” folder on your phone.

Step No 8:- Wait for the updating process to be completed and follow on-screen prompts.


If in case the device gets stuck in a boot loop, try to access the recovery mode menu; from there you then have to clear app data cache and to make a hard reset by selecting “wipe data factory reset” and “wipe cache partition”.

Done! You have successfully installed Android 6.0.1 Marshmallow KII-L21C185B301 firmware update on Honor 5X.

Let us know in the comments area below if you have any question or queries while updating your Honor 5X.

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