Hello, Asus Zenny users Here is the latest Asus Zenfone 2 Official Android 6 Full Firmware Version WW-4.21.40.184 (MM).

Asus Recently released official full final stable Android 6.0 Android Marshmallow update, yet for the official OTA push notification users they need to wait a little bit for the information to appear. For now, there official firmware can be downloaded and applied manually to Asus Zenfone 2.

As an Asus zenfone two users, i am not facing any issues after upgrading to Marshmallow from Lollipop, everything works smooth, and as far as battery concern it has a quite good battery backup.

Also Read: Official Beta Full Firmware Android Marshmallow ASUS ZenFone 2 V4.21.40.134 (Previous version )

General Tip Before proceeding to update procedure:

Make Sure you have done a full backup of your valuable data, upgrading to Android 6 Marshmallow won’t be wiping your data but to be on safe side, you must backup of the important things.

How to Update/Upgrade

Asus Zenfone 2 Official Android 6 Full Firmware Version WW-4.21.40.184 (MM)

1. Download Full Firmware Version WW-4.21.40.184(Android M) from below download link.
2. Copy/Move it to the internal root directory storage.
3. Restart your phone.
4. After rebooting your phone, you will be getting a prompt notification about update found,
5. Just tap to update.
6. Now your phone will be restarting.
7. Let your phone idle for some time, only sit back and relax for a while as this process will take some time.
8. After the update, your phone will be restarting automatically. Initially, you will get Android is Upgarading| Optimizing your apps.
9. That’s it! Now check your Android Version number.
10. Congratulations and welcomes to Android 6.0 Marshmallow.

Check out: CM14 Cyanogenmod 14 Nougat List of Devices

Official Description

ASUS ZenFone 2=ZE551ML(Z00AD/Z00ADA/Z00ADB/Z00ADC)

Software Image: V4.21.40.184 for WW SKU only* (Android M)
Improvement Item:

1. Improve system stability
2. Improve Bluetooth stability
3. Improve ZenMotion related issue

For more information, please refer to:

1. TW：http://www.asus.com/Zen talk/to/ReleaseNotes
2. WW：http://www.asus.com/Zen talk/ReleaseNotes
3. CN：http://zentalk.asus.com.cn/ReleaseNotes

Official Steps of Update:

1. Check software version of your device**
2. Download device software and Update SOP (From “Manual” Item)
3. Only apply to same SKU update, Example: WW->WW, CN->CN,
4. The software update cannot transfer the software SKU and downgrade the software version.
5. Wrong SKU may cause update failure, please update the same SKU version only.

*How to know the device model?
Path: Settings->About-> Model number

**How to know the device software version?
Path: Settings->About-> Software information->Build number
***System upgrade may cause part of data missing; please backup your important data before system upgrading.

File Size: 1.19 GB

Download From Asus Server: Download

If you are facing any issues related to updating/downloading Asus Zenfone 2 Official Android 6 Full Firmware Version WW-4.21.40.184 (MM), feel free to let us know via comments below.