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 ZE550ML Z008 firmware: 
WW VERSION
Version WW-2.20.40.135  (WW) 
 
DescriptionRelease Note
ASUS ZenFone 2=ZE550ML software Image: V2.20.40.135 for WW 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
12)Fixed calling issue in Singapore
13)Fixed 3G cannot camp to H plus in some countries
14)Support Zawgyi Myanmar string translation
15)Move Screenshot settings to the first layer
16)Allow Clean Master S key to be uninstalled
17)Improve ringtone chooser stability
18)Improve the stability of Email App
19)Modify Italy PosteMobile MMS APN setting issue

New add:

1)Add Game Center
2)Add new wallpaper
3)Add Theme Store

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 Size1.09 GB                                                2015.12.24  update
Download fromGlobal

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