Manual update of WW SKU - Latest firmware for Zenfone 5 and Zenfone 6

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Please follow the steps below to manually update Zenfone 5 to the latest KITKAT version 2.21.40.44WW (or 2.21.40.39WW for Zenfone 6).



If you need the latest official WW ROM image for Zenfone 5 or Zenfone 6, you can get it from the following links below.

Please pay special attention on the following limitations before you update your phone,to prevent get an unrecoverable error.
1. Your current ROM should be WW sku (Settings/About/Software information/Build numbercan see it, ex. ASUS_T00F_WW_user_xxx)
2. Phone should not be rooted.
3. The bootloader should not be unlocked.


For 4.4 KitKat users:


a)  Download the ROM imagefrom below link to your PC or directly to your phone.

Zenfone 5 WW SKU (2.21.40.44)
http://dlcdnet.asus.com/pub/ASUS/ZenFone/A500CG/UL-ASUS_T00F-WW-2.21.40.44-user.zip

Zenfone 6 WW SKU (2.21.40.39)
http://dlcdnet.asus.com/pub/ASUS/ZenFone/A600CG/UL-ASUS_T00G-WW-2.21.40.39-user.zip

b) Connect your phone to a computer via a USB wire.

c) Copy the downloaded zip file into your phone (Internal storage folder). If you have downloaded directly to the phone then using the File manager move the file from the Download folder to the Internal storage outside all folders.

d) Unplug the USB wire from your phone, and then you may receive a notification on your phone. If you don’t receive notification, then turn off WIFI and Mobile data and restart the phone . After reboot you will get the notification.

e) Click it from Notification menu and start the update.




For 4.3 JB users:

a)  Make sure your current ROM version is the specific version as following, if not, please download from below link. Download to PC or directly to your phone.

Zenfone 5: WW SKU(1.18.4.40.10)
http://dlcdnet.asus.com/pub/ASUS/ZenFone/A500CG/UL_ASUS_T00F_WW_1_18_40_10.zip

Zenfone 6: WW SKU (1.18.40.12)
http://dlcdnet.asus.com/pub/ASUS/ZenFone/A600CG/UL_ASUS_T00G_WW_1_18_40_12.zip

b) Connect your phone to a computer via a USB wire.

c) Copy the downloaded zip file into your phone (Internal storage folder). ). If you have downloaded directly tothe phone then using the File manager move the file from the Download folder to the Internal storage outside all folders.

d) Unplug the USB wire from your phone, and then you may receive a notification on your phone. If you don’t receive notification, then turn off WIFI and Mobile data and restart the phone . After reboot you will get the notification.

e) Click it from the Notification menu and start the update.

f) Continue to download the latest  KITKAT 4.4 ROM again and follow the steps ‪#‎b to ‪#‎e to upgrade again


Zenfone 5 WW SKU (2.21.40.44)
http://dlcdnet.asus.com/pub/ASUS/ZenFone/A500CG/UL-ASUS_T00F-WW-2.21.40.44-user.zip

Zenfone 6 WW SKU (2.21.40.39)
http://dlcdnet.asus.com/pub/ASUS/ZenFone/A600CG/UL-ASUS_T00G-WW-2.21.40.39-user.zip