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 

Download only FOTA Files Here
 


ZENFONE 2 ZE551ML Z00A firmware: 
WW VERSION
Version V2.20.40.160 (WW)
 
DescriptionRelease Note
ASUS ZenFone 2=ZE551ML(Z00AD/Z00ADA/Z00ADB/Z00ADC) software Image: 2.20.40.160 for WW SKU only*
Improvement Item:

Update ASUS ZenUI Launcher App

For more information please refer to:
TW:http://www.asus.com/zentalk/tw/ReleaseNotes
WW:http://www.asus.com/zentalk/ReleaseNotes
CN:http://zentalk.asus.com.cn/ReleaseNotes

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 Size1.13GB                                                                2015.12.31 update
Download fromGlobal

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