Asus ZenFone Zoom
Android Marshmallow OTA rolls out for Asus ZenFone Zoom and ZenFone Selfie Asus

Asus has just started rolling out its highly-anticipated Android Marshmallow update for the ZenFone Zoom and ZenFone Selfie smartphones in order to keep up with its deadline of upgrading these devices to Marshmallow by Q3 2016.

Following the ZenFone Max and a couple of ZenFone 2 Laser models, the new ZenFone Zoom and ZenFone Selfie variants are now being upgraded to Android 6.0 Marshmallow with build numbers ZX551KL and ZD551KL respectively. Both the Zoom  and Selfie smartphones are getting a new firmware upgrade with version number 4.21.40.74 and 21.40.0.1692 wherein a bunch of third-party bloatware is being replaced with just a couple of new apps from Google and Facebook.

Check out the complete changelogs for both the ZenFone Zoom and ZenFone Selfie phones (courtesy Asus Forum):

Zenfone Zoom 4.21.40.74:

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)

Add new features and new apps:
- Google Calendar
- Google Messenger
- Facebook
- Facebook messenger
- Instagram

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

Multi-user and SnapView will not be supported. If you wish to continue to use multi-user, please keep using current account.

ZenFone Selfie 21.40.0.1692:

"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
 (TW SKU)
(14)Dr. Eye (TW SKU)
(15)Yahoo
購物中心 (TW SKU)"

"Add new features and new apps:
- Google Calendar
- Google Messenger
- Motion Gesture
- Camera: Pano Sphere Mode"

Remove Asus Email, Asus Calendar, Asus Messaging after Factory Reset. You could use Gmail, Google Calendar, Google Messenger for relevant services.

Those who cannot wait for the official OTA notification on their ZenFone can go ahead and download the same manually via Asus's support website , using the links given below:

Asus ZenFone Zoom

Asus ZenFone Selfie

[Source: ASUS Forum ZenFone Zoom, ASUS Forum ZenFone Selfie]