Before going any further:

Unlocking your bootloader, and/or installing custom 3rd-party software onto your ZenFone will void your warranty. If you brick/damage your device, or render it unusable, ASUS will not be responsible for it.

Okay, with that out of the way, unlocking the bootloader on your phone may not mean anything to the typical smartphone user. However, for enthusiasts and powerusers, that can be one of the first steps to releasing the phone’s potential. Again, this is different than an unlocked SIM – where you can hop from carrier to carrier. The bootloader is the software that initializes some hardware then the kernel and ramdisk for the phone upon boot up. It’s typically locked because OEMs want you to continue to use their software. However, ASUS has provided official unlock tools allowing you to do whatever you want (at your own risk) to your ZenFone 2. In this article, I’ll show you how to unlock your ZenFone 2 Laser.

What you’ll need

  • ZenFone 2 Laser (ZE551KL)
  • ZenFone 2 Laser unlock tool (Download link)
  • USB cable to plug your phone into your computer

Here’s how to unlock your bootloader

  • Download the unlock tool onto your computer
  • Plug your phone into the computer via USB
  • On your phone, go into Settings > Security and check the Install from Unknown Sources Option


  • Save the Unlock Tool APK file onto your phone into any folder that you’ll remember
  • Open the File Manager app on your phone and locate the Unlock Tool file and open it
  • Read the warning about unlocking your bootloader – twice if you have to
  • Accept and Press the tab to unlock your bootloader!


The phone will go through the automated process. Once you’re finished, the phone will reboot and you should see the ASUS logo boot up against a white background indicating that you’ve successfully unlocked your bootloader. Pretty easy, right?

Now, you can install custom recoveries, root your device, and load custom ROMs and software to your heart’s content! For more information on what’s available in the development community, check out the XDA forum on the ZenFone 2 Laser. Happy flashing!



  1. I purchased a zenfone 2 on Craigslist, and picked up a 60$ straight talk byop kit because I like the straight talk plan.
    I followed the directions and I could make calls and send texts. But when I went to upgrade my APN settings to access my data, wouldn’t work no matter what. And I tried to make a call and it went to at&t customer service where they told me the phone was listed as unsold and the service was cut off on my device because of this.
    I payed 60$ for the phone and another 60$ for the service. They said there was nothing they could do and I would just have to get a new phone.
    The phone still comes on and I can use WiFi.
    Please tell me there is someway to bypass the lock at&t put on my service?
    Of course I can’t get ahold of the asshole who sold me the phone for a refund, and I hate throwing money away. Any help would be greatly appreciated, thank you.
    My email is

  2. Can you unlock bootloader on ze551kl without computer.ive tried all one click root methods no pc and nothing works im running newest kernel on marshmallow.unknown sources on and usb debugging.Just want phone rooted.asus zenfone 2 laser ze551kl.

  3. This does not work – I have tried since June. I have the latest firmware from Asus’ website and the bootloader unlocked fails every time. It fails at the recovery portion just after powering off for the restart. I see “unlock failed” and it completes the boot.

  4. Not working with asus zenfone laser ZE550KL.
    After i click the unlock button ,it shows
    “Unfortunately,Unlock Device Tool has Stopped”