The trouble after unlock bootloader : Furthermore, such repaired Revised Product will not be covered under the warranty of the Original Product; the software of the repaired Revised Product will not be deemed the software of the Original Product and will not receive ASUS software updates. But we can re-lock the bootloader :D

DWYOR (Do it with your own risks)

Download Resources for Re-lock Bootloader :

  1. ASUS Zenfone 2 RAW file (ZE551ML) (Download)(Pass: www.asus-zenfone.com)
  2. ASUS Flash Tool 1.14 (Download)(Pass: www.asus-zenfone.com)
  3. Download recovery.img, boot.img, droidboot.img (Download)

How to Re-Lock Bootloader:


  1. Download files above
  2. Install ASUS Flash Tool on your Computer/Laptop
  3. Reboot your Zenfone 2 to bootloader (Power+volume up or Here)
  4. Open Asus Flash Tool apps
  5. Select Model Zenfone 2/ ZE551ML on Drop down menu
  6. Select RAW File (Click on Box button)
  7. Choose wipe data
  8. Connect Zenfone 2 to Laptop/PC
  9. Your device will be appear on device list
  10. Click Start Button
  11. Wait until Finish
  12. Download ADB tool and install it (Download)
  13. Reboot your Zenfone 2 to Bootloader again
  14. Place recovery.img, boot.img and droidboot.img to a folder
  15. Open the folder and press shift+right click > open command here
  16. Connect your Zenfone 2 to PC/Laptop
  17. Type on CMD (press enter after each line):
  18. fastboot flash fastboot droidboot.img
    fastboot flash recovery recovery.img
    fastboot flash boot boot.img
  19. Download Asus Zenfone 2 Ze551ml firmware (Download)
  20. Enter recovery (Tutorial Here)
  21. Select Apply update from adb
  22. Open Ze551ml firmware folder and press shift+right click > open command here
  23. Connect your Zenfone 2 to PC/Laptop
  24. Type on CMD (press enter after each line):
  25. adb sideload UL-Z00A-WW-2.20.40.97-user.zip
  26. Done


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