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)
6) Unzip the files and click on Install adb-setup-1.4.3.exe (You can find this in Bootloader Kit)
Congratulations, your device has been unlocked unofficially. (You can see the "Device State" on FASTBOOT splash screen)
6) Unzip the files and click on Install adb-setup-1.4.3.exe (You can find this in Bootloader Toolkit)
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).
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).
Last edited by a moderator: