Home MyZen Official bootloader unlock for ZenFone 2 is now available

Official bootloader unlock for ZenFone 2 is now available

Official bootloader unlock for ZenFone 2 is now available

Unlocking your bootloader allows you to put custom software onto your device. Many developers have created custom ROMs and have had to hack their way into the ZenFone 2 to make this available to powerusers in the community.

Now, unlocking the bootloader is as easy as downloading the utility, installing it, and running it.

Proceed with caution and read below notice before attempting

Download the utility HERE

From the ASUS Support site: Unlock Device App: Unlock bootloader

Notice: 1. Update your software image to V2.20.40.59 or latest version 2. Before you download, install, and use the Unlock Device App you acknowledge and assume complete risk to the quality and performance of this App, including but not limited to the following: once you activate the App you will not be able to recover your ASUS product (“Original Product”) back to original locked conditions; the Original Product with the activated App will not be deemed the Original Product; the Revised Product will no longer be covered under the warranty of the Original Product; the software of Revised Product will no longer be deemed the software of the Original Product and can no longer receive ASUS software updates; your purchased digital content may also be affected.

You also acknowledge ASUS does not guarantee service satisfaction to any Revised Product, including events involving paid service requested by you to be performed to the Revised Product. 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. It is strongly advised that you avoid activating this App unless you fully understand and accept the risks that may arise.


    • How about you guys finally releasing android 5.1.1 or 6? I was happy with my asus purchase until i saw the bad battery life due to android 5.0 and all the bloatware added… Android 5 has a lot of issues, will the company ever release the android 6 update for the zenfone 2? or 5.1.1 at the least?

      • I totally understand where you’re coming from, and the community has been asking us about it too. The team is working hard and I’ve been asking them for an update roadmap so we can know when things will be available to us. Thankfully, you can remove a lot of the bloatware if you feel like it!

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  1. It is unacceptable that the company provides software for the use of their clients and say that this software interrupts the warranty !!
    it is a crime against the consumer! Create shame in the face and release the update to 5.1.1 nothing ….

    • Unlocking the bootloader voids the warranty since we would like you to stay stock and enjoy what we offer. Basically, if you mess up your phone, it’s on you. Many in the modding community would agree with that. It’s not a crime especially when we warn you ahead of time that there are consequences. With regards to 5.1 or more recent OS versions, demands don’t help anyone. However, I’ve asked the team at HQ to provide a roadmap of updates. Enjoy your Zenfone!

      • If the Asus think the rooting process or bootloader is “illegal” or should not be done, you can not provide tools for it!
        Anyway any software or tool provided by the manufacturer could break the Product warranty!
        Okay of installation of an alternative firmware break the warranty , however only use the process of rooting or bootloader to make some blocked options available can not break the warranty!
        For example, there are N software that are not used by many customers and it is only possible to remove them after rooting the device! that while keeping the original firmware.
        if I paid for the device I have the right to decide WHAT want to or not 3rd software inside it! and these 3rd software uninstall option should not come locked from the factory!
        These 3rd software and the lack of system update is WHAT takes 90% of the common users to do root on your device and install an alternative software.
        With so much “junk” placed on the device have forgotten the basics, as a low-latency audio “driver”, same are the ASIO audio drivers (available for Windows, Mac and Linux) what would help a lot in audio and multimedia professionals. Apple and Samsung devices have technology for audio “without” latency on your devices

          • I have the same issue – stock ZenFone 2 with some of the default apps disabled, never rooted, fully updated.

            Using the unlock utility gives me an “unlock fail… rebooting in 5 seconds.” Whenever I try to start it up in fastboot, it’s locked in the same failure and message loop even without queuing another unlock attempt.

          • Yes, I was able to duplicate the issue and sent the info to our team in HQ to see if they can fix the problem.

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  2. Phone : ze551ml
    Firmware :
    Installed the APK to unlock bootloader from Asus’ website. I have the inverter Asus logo. I am unable use faatboot, I get the unluck successful….reboot in 5 seconds.
    This defeats the purpose of using the unlock tool if I cannot do anything with the phone. I cannot root it, I cannot change the recovery, I cannot change the OS. Is the bootloader really unlocked?
    I tried to load via adb sideload, nothing works.

    Asus Khang, if there is a fix, please let us know.
    Anything that can make the faatboot work again

  3. I can’t seem to get anything to save to my sd card through the phone itself..any tips on of this bootloader would let me do that? I’ve already tried the Asus custom settings and it doesn’t work.. also there’s half of my Rom that is unused but it won’t let anything save. It says system reserved space.. any help or solutions would be great

  4. I am also having boot loader issues …
    Now I cannot go to fastboot mode it always fails and reboots
    please update us when you find a fix !
    Even a fix that will not unlock the boot loader just allow fasboot not to reboot will be great
    I can add that while I tried this I had 2 Sims installed and an 8 GB SD card.. if it helps.


  5. I understand unlocking the bootloader voiding the warranty, even though I don’t agree with it (the theory supposedly being that installing an alternate ROM could actually cause physical damage to the HW, which is highly unlikely – even ‘bricking’ a device by flashing it is usually just putting it into a state where you can’t get a response from it to reflash or recover without resorting to JTAG or other extreme methods)

    However, I really do think Asus hasn’t really thought through this position on no more software updates just because you’ve unlocked the bootloader. Obviously I could see no SW updates if you’re running a modded ROM (and likely if you are, you don’t WANT those SW updates at that time), but if you want to go back to stock and check out the latest release of official from Asus you should be able to. Just because the bootloader is unlocked should not prevent you from re-flashing the stock ROM and then getting Asus SW updates. By taking this position, Asus is essentially saying once you leave our SW you can’t come back. That’s damned short sighted if you ask me, since it prevents people who maybe want to give the stock Asus SW a 2nd chance from doing so.

        • thank you very much
          that did the trick
          up and running now
          this forum has been extremely helpful.
          My Experience
          1 – Brand New Z00A / ZenFone24GB / ZE551ML
          2 – Installed Asus Unlock Tool
          3 – Phone stuck with bootloader that cannot be flashed
          4 – Followed Level99’s posts [http://forum.xda-developers.com/zenfone2/general/official-asus-ze551ml-bootloader-unlock-t3224747/page28]
          5 – Installed Twrp
          6 – I installed the wrong twrp
          7 – Followed playingmax’s instructions
          8 – 100% up and running – unlocked, rooted, ROM changed

        • It said root successful, or unlock successful? because the tool should only unlock the bootloader for you. It’s good you got the white splash screen though. That should mean it is unlocked. But doing so won’t give you root. How did you flash TWRP?

          • Typo. I meant “Unlock successful… rebooting in 5 seconds”

            Splash screen is white, bootloader is still stuck in a loop and I cannot flash in TWRP.

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  6. I also have the unlock successful rebooting in 5.

    I’ve tried just about everything I can think of and unfortunately haven’t been successful with the Level99 method.

    adb sideload works for me, but I was already on the latest version and that’s all I can load successfully. If this is solely a US problem is there a way to switch to the CN packages?

    Or alternatively, can the team release a zip with TWRP that has a verified signature that adb sideload will accept? Since, it looks like the verify signature portion is where it fails.

    I don’t know, I’m not a developer or anything. Just hoping this can be solved sooner or later since the latest update messed up my modem and I can no longer get on the data network, which is what prompted me to unlock my bootloader.

    • Hey Robby – Sorry to hear that you ran into that issue! We should be getting an OTA soon that will help to fix the reboot issue. Since you can ADB sideload, wait for the OTA. Level99’s method seemed to work for most, even myself who admittedly isn’t the most technical person. We also can’t release a zip with TWRP.

        • Hi Robby, I wish I had a timetable for you. The HQ team understands how important this next OTA is and will release it – I want to say in the next week or so. They still need me to test it based on the unlock error, but they haven’t sent me the OTA. If I find that it’s still causing some issues, it might delay it.

          • Well I appreciate you giving a rough estimate. Please let us know on the XDA thread when you start testing. I’ll check back there to see how it’s going.

          • Hey Khang,

            Just loaded the newest WW update. The only change is that now when I hold the vol up key I no longer get it to error out. It just always says unlock successful rebooting in 5.

    • Hi Zhoeragan,

      It might be that you have a couple conflicting SMS apps. Which do you use? If you don’t use the stock “Messaging” app, and use something like Google Messenger, the Messaging app will still show that you have SMS unread. Is this your problem or something else?

      • I am only use asus messenger,i try to clean recovery mode but i can’t login to recovery mode with error notification, actually i want to use bootloader unlock but in the forum said if we had done with that we can’t upgrade our os anymore. By the way thank to your suggestion.

  7. _Firstly since the last system update, bluetooth e beaten longer function properly. I can no longer associating new devices or to receive more than two files at fois..si I must receive five files, from the second connection is interrupted. ASUS to thank you for helping me fix that.
    _secondly I would like to know when the release of lollipop 5.1 on Asus ZenFone 2 550ml. RAM of my phone is always full, it m’affiche a utilization rate of 86 on average, even when the phone is standby, it is not normal. for a device 2GB RAM and 4 hearts, and more 64bits is really annoying. has when the output patch for all small bugs that this.
    _thirdly the possibility of a shortcut file on the home screen no longer exists, it was pretty awesome why ASUS has he removed this feature
    _fourthly the music volume is low. taking pictures is disappointing night photos taken at night are unreadable 13mg of pixels is far from reflecting what we have known for example with the Nokia N8. Bluetooth sharing no longer works here 5.0- version 43user

  8. ive had a problem with my recovery fron the day i bought the phone. whenever i try to boot into recovery i get error. i have to press volume up and power buttton which will take me to recovery. i unlocked my bootloader lastnight and i keep getting rebooting in 5 seconds . the ze551ml 2gb will not allow me to root or install another recovery to see if i can fix the issue of rebooting issue whenever i try to go into bootloader.

  9. I must state that after using the “fastboot flash recovery recovery.img” command using android sdk tools. the phone says failed, permission required.. or something like that but when I disconnected and rebooted to recovery ..twrp recovery was actually installed even though it said it failed. i flashed the superuser zip file through twrp and it also rooted the phone beautifully without issue. now when i boot into recovery i no longer get an error message and no more boot loop when i boot into fastboot mode. i will now flash a custom rom and report my findings.. thanks to the xda developer guys also.

  10. How funny that the phones tech/support team has to refer to xda for help. This app doesn’t work on ze500cl. Was att zf2e, flashed Asus fw, with tethered cwm, 118. Maybe something about unlock servers are down

  11. OK, this is a bunch to type and I’m so dumb technologically but here goes,hope u can help. My son bot Asus zen2E att and online I paid to get unlock code.success. he starts service with family mobile, runs out of data. Thru settings he then shuts off WiFi and data. He changes pattern lock goes to sleep and promptly forgets next day. When I follow directionsfor ffactory data reset, I get no option to do so once entering recovery and choosing it. Only options are reboot then install from adb then install from micro SD card. WHY WHY WHY CANT I GET FDR OPTION OR WWIPE DATA OR THE OPTIONS PEOPLE AND BLOGS ALLAY TO?!? PHONE USELESS FOR WEEKS NOW… JUST WANT TO KNOW WHY THIS FATORY DATA RESET OPTION IS MISSING AND WHAT TO DO NOW? HELP AND THANK YOU TONS IN ADVANCE.

  12. I have a prepaid AT&T ZenFone 2E. Will this work the same for this phone as well? Is the 6.0 update scheduled for this phone at the same time or will it be left behind or later? I too am having problems on 5.0 with it being very slow and cumbersome even compared to my previous BLU Air.

  13. I tried to run the Unlock Device Tool app, but doesnt seem work. I didnt see the white splashscreen.
    Even worse, I can not go to fastboot (bootloader) mode, instead I see a black screen with a USB logo shown.
    Is there any way to get into fastboot/bootloader mode in my situation now?

  14. im not sure if this has been anawered already or not, i havent read the entire.thread yet but, is there a way to unlock thw bootloader on the Zenfone 2E ZE500CL, ive searches the internet and mostly find tos that help every model, except for mine. the few ive found that claim to be for the ZE500CL turn out to be for the 550 or 551…any information would be helpful.

  15. Just wondering what the current state of the boot loader unlock tool is. Have the issuses people were experiencing been resolved? If I run the tool on my ZenFone 2 now is it likely to cause problems, or is it working ok for most users?

    I fully accept the risk that comes with unlocking and I applaud ASUS for releasing it. It would be nice however if you could offer a way to restore it back to original condition. Is this possible?

    Thanks for any advice that can be offered.


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  17. […] Son derece ilgi gören Asus ZenFone serisine son olarak çok sayıda ZenFone 2 modeli eklendi ama daha önceden olduğu gibi bu cihazların başlatma sektörü olan bootloader ile koruma kilidi geliyor. Bu yüzden özel tip ROM paketleri yüklenemiyor. Meraklı kullanıcılardan biriyseniz ve Asus ZenFone 2 ile farklı ROM deneyimini tatmak istiyorsanız Asus ZenFone 2 Bootloader kaldırma aracını denemelisiniz. Merak etmeyin bu araç Asus tarafından geliştirildi ve Asus ZenFone 2 kullanıcılarının dikkatine sunuldu. Asus açıklamasına göre bu aracı kullanmadan önce kullanıcıların Asus ZenFone 2 yazılımını versiyon ya da üstüne terfi etmeleri gerekiyor. Asus'un bu adımı özel ROM paketlerini geliştirenlere destek verdiğini gösteriyor. Açıklamalar ve uygulama için http://myzen.asus.com/2015/10/13/official-bootloader-unlock-for-zenfone-2-is-now-available/ […]

  18. OK So U can not use the unlock from ASUS.
    Now How do I get the screen lock pattern to turn off? I called ASUS and we went thru the process but did not get it unlocked. This is the only thing in my way so if any of you have the answer, Instructions that I can follow I would be very grateful Zenforce2 4G-64K dual sim or a 128 k chip installed I love the phone and was getting rid of all the stuff I do not need and something froze the phone and I can not get past the screen lock no matter what pattern i try. all the items come up on screen but no access. I am just about out of the one yr. warranty so how bad can it be. TKS, Much William

  19. GATE 2017 Results Date has been confirmed and the hopeful candidates who have appeared in the examination now have to wait for just few days. As per the IIT Exam Schedule released by IIT Roorkie, the GATE 2017 Result is going to be announced on 27 March 2017.

  20. i want unlock my boot loader.i have asus zenfone 2 laser.i installed device unlock tool but its not unlock my decive.always seen ”AN UNKNOWN ERROR OCCURS,WHICH MAY BE A NETWORK CONNECTION ISSUE.PLEASE WAIT AND TRY AGAIN LATER”BUT i already connect internet.please tell me what shoult i do.

  21. GATE 2017 Results Date has been confirmed and the hopeful candidates who have appeared in the examination now have to wait for just few days. As per the IIT Exam Schedule released by IIT Roorkie, the GATE 2017 Result is going to be announced on 27 March 2017.

  22. Hello,
    What is the meaning of this message from the Asus unlock app?:

    “You do not have pin password to verify your device, do you still want to proceed?”

    This is a big fail as far as customer care is concerned. You spend about 10 000 legal words warning us of loss of our rights should we proceed to unlock, but you can’t afford more than 16 words to write a meaningful message for the actual unlock?

    Please advise.
    Thank you