Asus Zenfone 5 Firmware V2.20.40.13 (Fix USSD issue)

Firmware V2.20.40.13 is the latest firmware update from ASUS to Zenfone 5 (T00F / T00J). In this firmware update there is quite a lot of repair: Fixing a problem USSD, OTA ​​update Unlock the SD card in recovery mode, and much more. And there are several additional new features in firmware V2.20.40.13, if you want to discover more and download the firmware V2.20.40.13. Following Asus Zenfone 5 Firmware V2.20.40.13

In this Firmware update is no difference between WW version and TW / CN / CHT. In WW Fimware version using the code V2.20.40.13, whereas for TW / CN / CHT Firmware version using the code V2.20.40.9.

Improvement Item:

  1. Fixed the reddish issue of front camera
  2. Fixed create new interface get NULL value
  3. Fixed hookey not hold on when SIM2’s phone call.
  4. Fixed – APK files can’t be send via Bluetooth
  5. Enable SD card OTA update on recovery mode
  6. Fixed Line will crash when switch the front/rear camera
  7. Fixed – Audio playback on Bluetooth headsets (A2DP) is too soft
  8. Fixed maxxaudio effect is stopped when turning on google equalizer
  9. Fixed – FM radio reception breaks after 15 minutes
  10. Fix Cloud Print version update issue
  11. Fix USSD issue which randomly fails to be executed correctly when using Secondary SIM

New Feature:

  1. Add release note website link for ASUS Software Update, users can check release notes details directly through the link
  2. Add Feedback APP for users to communicate and send feedback to ASUS fast and easily

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 5

  • How to OTA update on Asus Zenfone 5 ?
    Path: Settings>About>System Update>Check for Update
  • How to update via ADB sideload ?
    Tutorial Here
  • How to update Manual ?
    Tutorial Here

Asus Zenfone 5 Firmware V2.20.40.13 (WW)

Firmware Versi V2.20.40.9 (WW) ( to

File Size 737.81 MBytes                                           update 2014/11/12
Download from Global

Asus Zenfone 5 Firmware V2.20.40.9 (TW/CN/THT)

Firmware Versi V2.20.40.9 (TW)

File Size 753.42 MBytes                                            update 2014/10/29
Download from Global

Firmware Versi V2.20.40.9 (CHT)

File Size 754.55 MBytes                                           update 2014/10/29
Download from Global
Firmware V2.20.40.9 (CN)

File Size 643.82 MBytes                                           update 2014/11/03
Download from Global
Asus Zenfone 5 Firmware V2.20.40.13 (Fix USSD issue) | admin | 4.5
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