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: 
CN VERSION
Version V2.20.40.150  (CN) 
 
DescriptionRelease Note
ASUS ZenFone 2=ZE551ML(Z00AD/Z00ADA/Z00ADB/Z00ADC) software Image: V2.20.40.150 for CN SKU only*
Improvement Item:

1.Several Apps update
2.Fix icon display issue in Settings
3.Improve the stability of Snap View
4.Improve the stability of Lockscreen
5.Improve the stability of Camera 
6.Fixed WiFi Hotspot issue
7.Fixed Data transmission issue
8.Fixed Bluetooth transmission issue
9.Fixed SD card related issue
10.Extend the shutdown mimunes by power key press.
11.Improve the compatibility of apps

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 Size1.03GB                                                                             2015.12.17 update
Download fromGlobal
WW/TW soon

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