How to Change Zenfone 2 Firmware from CN/TW to WW

Today ASUS Zenfone Blog will teach you How to Change Zenfone 2 Firmware from TW/CN to WW. Asus Zenfone 2 firmware divided by three region CN for China, TW for Taiwan and WW for Worldwide/Global. By changing SKU/Firmware from your original SKU/firmware can make your Zenfone 2 will not able to  get OTA firmware, but you can do it Manually via ADB Sideload / SD Card update.

DWYOR (Do it With Your Own Risks)

Files to Download:

1. Asus Zenfone 2 Recovery Images ZE550ML=Z008, ZE551ML=Z00A (DOWNLOAD)
2. Asus Zenfone 2 Firmware (Download for ZE550ML, Download For ZE551ML)-> Choose Android then Firmware and choose WW version
3. Intel USB Driver (Download)
4. ADB (Download)

Instructions:

1. Download all files above (Note: choose same recovery and firmware ex: download Z00A 2.17.40.12  and download 2.17.40.12 firmware)
2. Install Intel USB Driver
3. Open Downloaded ADB then extract it
4. Place recovery, firmware to ADB Folder
5. Enable USB Debugging (Settings>About>Software Information>Tap Build Number 7 times then in settings developer option menu tick usb debugging)
6. Connect Zenfone 2 with PC/Laptop
7. in ADB Folder press shift+right click > open command here
8. Check Zenfone 2 connected properly or not (Type in cmd: adb devices) "press allow and remember your choice" on zenfone 2 screen
9. You will see your Zenfone 2 on cmd list
10. Type in cmd: adb reboot bootloader
11. Zenfone 2 will reboot to bootloader
12. Type This at CMD:
    fastboot flash recovery recovery.img
    fastboot flash boot boot.img
    fastboot flash fastboot droidboot.img
13. Reboot Phone
14. Copy Zenfone 2 firmware to Phone Storage and wait for notification and wait until finish or you can flash via ADB Sideload