Asus Zenfone 4 Firmware Update V6.6.3

Asus Zenfone 4 Firmware Update V6.6.3 – ASUS has updated the firmware for Zenfone 4 (A400CG) with software Image: V6.6.3. In this firmware update there is an Fixed application time zone issue for Russia.

Actually we hope ASUS directly provide an update to Android 5.0 Lollipop, but that’s okay though this is only a minor update. And we hope that ASUS provides updates Andoid 5.0 Lollipop to Asus Zenfone as scheduled. (Schedule Update Android 5.0 Lollipop On Asus Zenfone)

If you want to update the firmware on Zenfone 4, but you still have not got the Zenfone OTA updates you do not need to worry, because at this time Asus Zenfone Blog will share a link to download the Firmware Update V6.6.3 for Zenfone 4 (T00I).


  1.  Fixed application time zone issue for Russia

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, TW->TW.
  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 update the firmware on Asus Zenfone 4

  • How to OTA Updating on Zenfone 4 ?
    Path: Settings->About->System Updatete->Check for Update
  • How to update via ADB sideload ?
    Tutorial Here
  • How to Manually Updating Firmware V6.6.3 ?
    Tutorial Here

    For OTA file

    • Rename file that you downloaded into UL-ASUS_T00I-WW-
    • Move OTA file to Internal Storage
    • You will see notification and press it

*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.

Asus Zenfone 4 Firmware V6.6.3

Firmware V6.6.3_WW

File Size 822.93 MBytes                                          update 2015/01/13
Download from Global

Firmware V6.6.3_CHT

File Size 864.75 MBytes                                          update 2015/01/27
Download from Global
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