[UPDATED][GUIDE] UNLOCK/RELOCK BOOTLOADER UNOFFICIALLY FOR ZenFone 3

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Saktis_STi

Saktis_STi

Senior Member
Jan 27, 2018
453
244
Kuala Lumpur
Make sure you’ve backed up all of your IMPORTANT DATA before unlocking/relocking bootloader because this process WILL DELETE ALL OF YOUR IMPORTANT DATA !

I am not responsible for bricked devices and dead SD cards. YOU are choosing to make these modifications, and if you point the finger at me for messing up your device, I will laugh at you.

This process will not void the device warranty & you will get OTAs

First and foremost, please install ZenFone 3 Drivers via Device Manager (Download drivers on ASUS Support Website)

1) Download the Factory RAW ROM here:

ZE520KL:


ZE552KL:


2) Download ASUS Flash Tool here:


3) Flash the firmware via ASUS Flash Tool by entering FASTBOOT MODE (Power Button + Volume Up) & DO NOT WIPE DATA!

Note: This firmware can only boot into FASTBOOT Mode. So, don’t panic

Note: If you flash RAW firmware via ASUS Flash Tool and received an error (FRP request error), just IGNORE the error.

4) Download Bootloader Kit for ZenFone 3 here:


5) Enter FASTBOOT mode (Power Off + Volume Up)

UNLOCKING​

6) Unzip the files and click on Install adb-setup-1.4.3.exe (You can find this in Bootloader Kit)

  • Hold Shift and Right Click on any area in the folder (click on ”Open Powershell window/Open Command Window)
  • Now copy and paste this: fastboot devices
  • If it shows serial number of your ZenFone 3, you are good to go
  • Now copy and paste this: fastboot oem unlock
  • After that, copy and paste this: fastboot reboot bootloader

Congratulations, your device has been unlocked unofficially. (You can see the "Device State" on FASTBOOT splash screen)

RELOCKING​

6) Unzip the files and click on Install adb-setup-1.4.3.exe (You can find this in Bootloader Toolkit)

  • Hold Shift and Right Click on any area in the folder (click on ”Open Powershell window/Open Command Window)
  • Now copy and paste this: fastboot devices
  • If it shows serial number of your ZenFone 3, you are good to go
  • Now copy and paste this: fastboot oem lock
  • After that, copy and paste this: fastboot reboot bootloader

Congratulations, your device has been locked (You can see the "Device State" on FASTBOOT splash screen)

P.S: If you unlocked officially and you want to relock your bootloader, OTA does not work because your Serial Number has been recorded by ASUS.

7) After that, download the stock Oreo RAW ROM here and flash it via ASUS Flash Tool (FASTBOOT Mode) (DO NOT WIPE DATA):

ZE520KL:


ZE552KL:


If anything, contact me via Telegram
MOD EDIT: LINK REMOVED
The distribution of social media links is no longer allowed on XDA. Please refer to the thread linked below:
Telegram and Whatsapp Channels - Going Forward

Note: If you flash RAW firmware via ASUS Flash Tool and received an error (FRP request error), just IGNORE the error.

Note: If it asks for PIN after booting up, just wipe data & cache via Recovery Mode (Power Button + Volume Down).
 
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AnAn.

AnAn.

Member
Oct 27, 2017
33
0
How to delete the start message in Zenfone 3 ZE552KL after officially unlocking Bootloader?
 
B

bibihub

Senior Member
Oct 12, 2012
111
22
Ok so this time it worked ! Thanks @ZenFone_3
Now I'm on the latest oreo update (1801) with bootloader unlocked.
But no twrp yet. For some reason the flashing process of the twrp img finishes, but it is still the stock recovery that boots. I tried multiple times and downloaded the twrp img again but no luck. I'll try to figure that out.
 
G

gio14

New member
Sep 6, 2010
4
1
hi i get this error

khDe0n
can open file gzya etc. and wont continue to flash
 
Last edited:
kuranzi

kuranzi

Senior Member
Dec 10, 2015
361
53
Padang
Samsung Galaxy A72 4G
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    Saktis_STi
    Saktis_STi
    Make sure you’ve backed up all of your IMPORTANT DATA before unlocking/relocking bootloader because this process WILL DELETE ALL OF YOUR IMPORTANT DATA !

    I am not responsible for bricked devices and dead SD cards. YOU are choosing to make these modifications, and if you point the finger at me for messing up your device, I will laugh at you.

    This process will not void the device warranty & you will get OTAs

    First and foremost, please install ZenFone 3 Drivers via Device Manager (Download drivers on ASUS Support Website)

    1) Download the Factory RAW ROM here:

    ZE520KL:


    ZE552KL:


    2) Download ASUS Flash Tool here:


    3) Flash the firmware via ASUS Flash Tool by entering FASTBOOT MODE (Power Button + Volume Up) & DO NOT WIPE DATA!

    Note: This firmware can only boot into FASTBOOT Mode. So, don’t panic

    Note: If you flash RAW firmware via ASUS Flash Tool and received an error (FRP request error), just IGNORE the error.

    4) Download Bootloader Kit for ZenFone 3 here:


    5) Enter FASTBOOT mode (Power Off + Volume Up)

    UNLOCKING​

    6) Unzip the files and click on Install adb-setup-1.4.3.exe (You can find this in Bootloader Kit)

    • Hold Shift and Right Click on any area in the folder (click on ”Open Powershell window/Open Command Window)
    • Now copy and paste this: fastboot devices
    • If it shows serial number of your ZenFone 3, you are good to go
    • Now copy and paste this: fastboot oem unlock
    • After that, copy and paste this: fastboot reboot bootloader

    Congratulations, your device has been unlocked unofficially. (You can see the "Device State" on FASTBOOT splash screen)

    RELOCKING​

    6) Unzip the files and click on Install adb-setup-1.4.3.exe (You can find this in Bootloader Toolkit)

    • Hold Shift and Right Click on any area in the folder (click on ”Open Powershell window/Open Command Window)
    • Now copy and paste this: fastboot devices
    • If it shows serial number of your ZenFone 3, you are good to go
    • Now copy and paste this: fastboot oem lock
    • After that, copy and paste this: fastboot reboot bootloader

    Congratulations, your device has been locked (You can see the "Device State" on FASTBOOT splash screen)

    P.S: If you unlocked officially and you want to relock your bootloader, OTA does not work because your Serial Number has been recorded by ASUS.

    7) After that, download the stock Oreo RAW ROM here and flash it via ASUS Flash Tool (FASTBOOT Mode) (DO NOT WIPE DATA):

    ZE520KL:


    ZE552KL:


    If anything, contact me via Telegram
    MOD EDIT: LINK REMOVED
    The distribution of social media links is no longer allowed on XDA. Please refer to the thread linked below:
    Telegram and Whatsapp Channels - Going Forward

    Note: If you flash RAW firmware via ASUS Flash Tool and received an error (FRP request error), just IGNORE the error.

    Note: If it asks for PIN after booting up, just wipe data & cache via Recovery Mode (Power Button + Volume Down).
    View
    4
    Saktis_STi
    Saktis_STi
    Oreo RAW firmware has been updated to WW_15.0410.1806.68. :)
    View
    4
    Saktis_STi
    Saktis_STi
    bones1014 said:
    Thank you.

    I can get that right off the asus website downloads under Firmware, correct? Just have to match the first two characters to have the right version for my phone?
    Click to expand...
    Click to collapse


    1) Download and install ASUS Flash Tool :


    2) Download Latest Oreo RAW

    ZE520KL:

    ZE552KL:

    3) Enter Fastboot Mode (Power + Volume Up)

    4) Open ASUS Flash Tool

    5) Select device & select firmware

    6) Connect phone to PC

    7) Hit Start and wait 10-15 minutes (ignore the error 5)

    P.S: Please back up all of your important data before flashing.


    MOD EDIT: PAY-PER-CLICK LINKS REMOVED
    View
    2
    Saktis_STi
    Saktis_STi
    ehbm said:
    If I do this unlocking method I'm gona keep my warranty if I have any issue and need to relock to send to the Asus? Or It can be detected?
    Click to expand...
    Click to collapse
    Just relock and send it to service centre. ASUS won't know ;)
    View
    2
    Saktis_STi
    Saktis_STi
    fuzzyfixer said:
    If I have flashed TWRP and a custom rom over it after that if I want to go to stock rom and recovery and relock the boot loader how can I do that and avoid boot loops. is it possible by following the above method.
    Click to expand...
    Click to collapse
    Just follow all the steps.

    Your device will be relocked and it will run on Stock ROM.
    View

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