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How to solve patch error related to fastboot.img, recovery.img and boot.img in ASUS Zenfone 5

Here are we with the solution of most irritating problem in ASUS Zenfone 5, it is the patch error in fastboot.img, recovery.img and boot.img which generally comes during flashing any new/old OTA update or full firmware.

Because of this error many users are unable to update their phone to lollipop, now question arises why this error occurs,

This problem is generated when you flash something unofficial and it changes your current recovery.img or fastboot.img.

So here we are with the solution, Read the steps carefully.


  • Recovery.img of firmware version
  • Fastboot.img of firmware version
  • Full Firmware version


  • Whatever recovery or fastboot you choose it should be of same firmware version which you are going to flash.
  • Your problem related to fastboot.img, boot.img or recovery.img will be solved in step 5, further steps are for lollipop update.
  • After step 5 your phone will be running at firmware version


  • Reboot your phone into bootloader.
  • Flash recovery.img of firmware version
  • Flash fastboot.img of firmware version
  • After flashing recovery and fastboot go to recovery mode of your phone and flash the full firmware version through sideload.
  • Reboot your phone.
  • Again go to recovery.
  • Now flash OTA update version through sideload.
  • Repeat step 5 and 6.
  • Now flash firmware version through sideload.
  • Repeat step 5 and 6.
  • Now flash Lollipop firmware
  • Reboot phone