There are many users of zenfone laser(ZE550KL) out there who probably unable to unlock the bootloader even using the ASUS official boot loader unlocker. therefore we make this guide. the best thing is you can install twrp and then flash any custom roms as you like without unlocking your bootloader anymore. Do at your own risk.
Step 2: open command prompt from the ADB directory via Shift+right click and selecting ‘open cmd from here
(keep it open)
Step 3: Now Enter the Following command in Command Window. (click Ok if Prompt on Your Device)
It will return your device code which confirms you have installed all the files properly.
Step 4: Now boot your device into Fastboot mode which allows flashing files, and enter the below command in command prompt. also you can Manually Reboot To Fastboot Mode By Switch off Your Phone And Press Volume Up + Power Key Together.
adb reboot bootloader
Step 5: Now to flash the TWRP recovery by just entering the below command.It Will Flash Twrp Recovery In Your Device..!!
fastboot flash recovery twrp.img
⇑(twrp.img is the file name)⇑
Step 6: Then in the fastboot mode ⇓ press the vol down button by holding it press the power button for 5 sec (VOL DOWN+ POWER BUTTON)
Boom Your Device Will now Boot Into TWRP Recovery..!! 😀 Now you can install custom roms you like in your zenfone laser without unlocking the bootloader.
Note: i recommend you to don’t do asus OTA Update after doing this process when you get back to stock for any reason. this post is made only because the official unlocker is not working.