[ROM][Android 6.0] ASUS ZenFone Zoom ZX551ML Marshmallow Firmware

In this post I will share Full Firmware .zip Marshmallow for ASUS ZenFone ZOOM. Before you update to marshmallow make sure backup your data and update to the latest Lollipop.

ZENFONE ZOOM ZX551ML Marshmallow Official firmware:
WW VERSION
Version WW_4.21.40.74 (WW)

Description	Release Note Software update to Android 6.0 Mashmallow. Internal storage will decrease slightly after update, suggest to back up data and relocate media file (pictures & video clip) to SD card to reserve enough storage before starting the software update. Android Marshmallow won't support APP2SD. Please move apps to internal storage before system upgrades. Multi-user function won't be supported if the account is deleted. Please keep your account to continue usage. The apps listed below will no longer be pre-loaded once your device has been upgraded to Android 6.0 (Marshmallow). Removed Apps: Omlet 1. Data Transfer Photo Frame ASUS Backup Dr. Safety What's next Party Link Remote Link PC Link Yahoo Shopping EZ TripAdvisor Zinio iReader Dr. Eye Google+ Puffin Browser Mirror Google Settings (Integrated with ASUS Settings) New Apps as follows: Google Calendar Google Messenger Dr. Booster Asus Email, Asus Calendar, Asus Messaging will no longer be pre-loaded in this version. You can use Gmail, Google Calendar & Google Messenger provides corresponding services

Description

Release Note

Software update to Android 6.0 Mashmallow. Internal storage will decrease slightly after update, suggest to back up data and relocate media file (pictures & video clip) to SD card to reserve enough storage before starting the software update.
Android Marshmallow won't support APP2SD. Please move apps to internal storage before system upgrades.
Multi-user function won't be supported if the account is deleted. Please keep your account to continue usage.
The apps listed below will no longer be pre-loaded once your device has been upgraded to Android 6.0 (Marshmallow).

Removed Apps:

Omlet 1.
Data Transfer
Photo Frame
ASUS Backup
Dr. Safety
What's next
Party Link
Remote Link
PC Link
Yahoo Shopping
EZ
TripAdvisor
Zinio
iReader
Dr. Eye
Google+
Puffin Browser
Mirror
Google Settings (Integrated with ASUS Settings)

New Apps as follows:

Google Calendar
Google Messenger
Dr. Booster

Asus Email, Asus Calendar, Asus Messaging will no longer be pre-loaded in this version. You can use Gmail, Google Calendar & Google Messenger provides corresponding services

File Size	1.45 GB Full Firmware
Download from	Full Firmware

How to Update with this .zip ROM ?

Via ADB Sideload or
Copy and Paste this .zip to Internal Storage ( Update notice will be pop up in your zenfone screen) and click update. or
Update via SDCard (Copy and paste .zip to SD Card then open recovery and choose apply update from sdcard)