[ROM][Full Firmware] ASUS ZenFone 2 ZE551ML Marshmallow WW-4.21.40.223

How to OTA update ? (Go to settings>About>System Update>Check for Update)
How to update Manual ? Place to Internal Storage>Restart>Click Update
How to update via ADB sideload ? Here 

ZENFONE 2 ZE551ML firmware: 

WW VERSION
WW-4.21.40.223

Description

ASUS ZenFone 2=ZE551ML(Z00AD/Z00ADA/Z00ADB/Z00ADC) software Image: V4.21.40.223 for WW SKU only* (andriod M) Improvement Item: 1)Improve Wi-Fi/Bluetooth stability   2)Update Security patch 3)Improve system stability  4)Support India SOS call (India only) 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.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 Example: ASUS_T00I **How to know the device software version?  Path: Settings->About-> software information->Build number ***System upgrade may cause part of data missing, please buckup your important data before system upgrading.

File Size	1.18 GB                                                2017.01.10  update
Download from	Global

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[Official ROM] ASUS ZenFone 2 ZE551ML/ZE550ML Android 6.0 Marshmallow

In this post I will share Full Firmware .zip Official Marshmallow for ASUS ZenFone 2 ZE551ML/ZE550ML you can read the official statement about Android 6.0 on ZenFone 2 Here. Before you update to marshmallow make sure backup your data.

ZENFONE 2 ZE551ML or ZE550ML Marshmallow Official firmware: 
WW VERSION

Version WW-4.21.40.134 (ZE551ML/Z00A)

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	1.1 GB Full Firmware
Download from	ZE551ML Marshmallow Full Firmware

Version WW-4.21.40.54 (ZE550ML/Z008)

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	1.1 GB Full Firmware
Download from	ZE550ML Marshmallow Full Firmware

How to Update to Marshmallow Zenfone 2 ZE551ML/ZE550ML ?

1. Go to Settings>about>system Update
2. Download .zip above and flash Via ADB Sideload or
3. Copy and Paste this .zip to Internal Storage ( Update notice will be pop up in your zenfone screen) and click update. or
4. Update via SDCard (Copy and paste .zip to SD Card then open recovery and choose apply update from sdcard)

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