[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 Size1.18 GB                                                2017.01.10  update
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