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Asus has now released Android 6.0 Marshmallow firmware update for a couple of its devices like the Asus Zenfone 2 Zoom ZX551KL, and Zenfone Selfie ZD551KL. We have seen a similar update for some flagship phones like ZenFone 2 Laser ZE500KL, Max, and their variants. The update is being rolled out in waves and hitting the devices in the countries like the United States, Italy, France from Europe, and also in Asian countries like India, China, Japan, etc. The Android 6.0 Marshmallow OTA update brings the firmware build number 4.21.40.74 to the ZenFone 2 Zoom and the build 21.40.0.1692 to the Selfie. The update consists of new Marshmallow features like Doze Mode, App Permissions, new Emojis, and not to forget the brand new ZenUI. The new Zen OS has a revamped user interface, new launcher, bug fixes, AOSP security patches and much more. Check out the changelog and downloads from below.

What’s new in ZenFone Zoom ZX551KL 4.21.40.74 OTA update?

1.[BSP]Update OS to Andorid M
2.APP2SD won’t be supported in Android 6.0 (Marshmallow). Please move apps to the internal storage before system upgrade.
3.The apps listed below will no longer be pre-loaded once your device has been upgraded to Android 6.0 (Marshmallow).
Thanks for your support.
(1)ASUS Backup
(2)Google Play Books
(3)Google Play Games
(4)Google Play Newsstand
(5)Google+
(6)ZenFlash (Can be downloaded from Google play)
4.Add new features and new apps:
– Google Calendar
– Google Messenger
– Facebook
– Facebook messenger
– Instagram
5.Remove Asus Email, Asus Calendar, Asus Messaging, Asus Browser and Asus Music after Factory Reset. You could use Gmail, Google Calendar, Google Messenger, Chrome and Google Play Music for relevant services
6.Multi-user and SnapView will not be supported. If you wish to continue to use multi-user, please keep using current account
7.Please backup your data before upgrading

What’s new in ZenFone Selfie ZD551KL 21.40.0.1692 OTA update?

1.Update OS to Andorid M
2.APP2SD won’t be supported in Android 6.0 (Marshmallow). Please move apps to the internal storage before system upgrade.
3.“The apps listed below will no longer be pre-loaded once your device has been upgraded to Android 6.0 (Marshmallow).Thanks for your support.
(1)ASUS Backup
(2)Mirror
(3)Remote Link
(4)Party Link
(5)PC Link
(6)Photo Frame
(7)What’s Next
(8)ASUS MyFrame
(9)ASUS MyWater
(10)Omlet
(11)Data Transfer
(12) Snap View
(13)EZ 訂 (TW SKU)
(14)Dr. Eye (TW SKU)
(15)Yahoo 購物中心 (TW SKU)”
4.“Add new features and new apps:
– Google Calendar
– Google Messenger
– Motion Gesture
– Camera: Pano Sphere Mode”
5.Remove Asus Email, Asus Calendar, Asus Messaging after Factory Reset. You could use Gmail, Google Calendar, Google Messenger for relevant services.
6.Please backup your data before upgrading

So go ahead and download the Android 6.0 Marshmallow on your Asus ZenFone devices. If you did not receive the updates over the air, go to [setting] -> [About] -> [system update] and manually update your device. You can also manually install the OTA updates using the tutorials below. (See the tutorials page below.)

Download ZenFone Zoom ZX551KL 4.21.40.74 OTA update

  • Asus ZenFone Zoom ZX551KL Android 6.0.1 → Download | File: UL-Z00A-WW-4.21.40.74-user.zip [1.43 GB]

The update link is an OTA and not the full firmware file. Hence, download the OTA update and head over to the suitable installation tutorial from below.

Note: You may also need to change the URL to your country website code. If confused, comment down below.

Download ZenFone Selfie ZD551KL 21.40.0.1692 OTA update

ZenFone Laser Max ZE550KL update → Download | File: UL-Z00T-WW-21.40.0.1692-user.zip [1.63 GB]

The update link is also an OTA file. You can also restore your device to stock with using this file. Asus has released this update officially. It says OTA but you can also install the update as a full firmware file. You may also want to change the URL to your country to download the .

Note: You may also need to change the URL to your country website to get the download the exact firmware for your device. If confused, comment down below.

How to Install Android 6.0.1 Marshmallow on Asus ZenFone Zoom and Selfie?

Download the OTA update and head over to this tutorial: How to Install OTA updates on Asus ZenFone device using stock recovery and ADB Sideload?

How to Install Full firmware on Asus ZenFoneSelfier and Zoom?

Get the full firmware file or factory image for your Asus device and head over to this tutorial. How to Install Full Firmware (Factory Image) on Asus ZenFone Device?

Source: Asus ZenTalk Forum 1,  Asus ZenTalk Forum 2

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