Question How to flash Android 12 onto Asus Zenfone 8 and relock bootloader.

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Adaoh

Senior Member
Jun 13, 2021
126
61
ASUS ZenFone 8
No, from my understanding, once you unlock the phone's bootloader, OTA updates are gone forever. You will need to download the updates manually and move them to the root storage. At least this does not require a restart. (Asus update site -> Files app -> find the .zip -> move it to "Internal storage" -> reboot)
 

tyzio

Member
Aug 3, 2021
14
2
Sorry for my mistake. After bootloader lock there is no possibility to update via OTA...
 

tyzio

Member
Aug 3, 2021
14
2
No, from my understanding, once you unlock the phone's bootloader, OTA updates are gone forever. You will need to download the updates manually and move them to the root storage. At least this does not require a restart. (Asus update site -> Files app -> find the .zip -> move it to "Internal storage" -> reboot)
Exactly
 

jholnardis

Member
Apr 28, 2014
13
4
f
No, from my understanding, once you unlock the phone's bootloader, OTA updates are gone forever. You will need to download the updates manually and move them to the root storage. At least this does not require a restart. (Asus update site -> Files app -> find the .zip -> move it to "Internal storage" -> reboot)
from this point as i have unlocked the phone i guess there is no advantages doing a relock. No OTAs, no warranty, no google payments back.... Indeed now i can manually update software just placing the file in the root storage. Anyonte would tell me a good reason to revert the situation?
 
Hello, I had a similar problem with locking the bootloader but I finally succeeded.
In the phone we enable debugging via USB.
Connect the phone to PC.
Download ADB Installer v1.4.3 from:
ADB Installer v1.4.3
Enter the command line from the administrator level.
In the command line enter all the commands one by one as shown in the image below.
View attachment 5572453
Disconnect the phone from PC, then reboot it and enjoy Android updates again via OTA and get rid of the message when turning on the phone stating that it is unlocked.

The whole procedure was done on Android 12 Version WW-31.1004.0404.107.

Best regards and I hope you will find this information useful:)
Hi Tyzio,

Finally got time to implement this, and followed your step by step process .... definitely made some progress I believe with the ADB Installer v1.4.3 and installed across the laptop.

Put the phone into fastboot, with USB Debugging and this is what I got:

PS C:\Users\roma_\OneDrive\Desktop\adb-setup-1.4.3> fastboot devices
M4AIB7626606MH7 fastboot
PS C:\Users\roma_\OneDrive\Desktop\adb-setup-1.4.3> fastboot flashing lock
...
FAILED (remote: Unrecognized command flashing lock)
finished. total time: 0.004s
PS C:\Users\roma_\OneDrive\Desktop\adb-setup-1.4.3> fastboot oem asus-csc
...
FAILED (remote: Command not supported in default implementation)
finished. total time: 0.005s
PS C:\Users\roma_\OneDrive\Desktop\adb-setup-1.4.3> fastboot oem asus-csc_lk
...
FAILED (remote: Command not supported in default implementation)
finished. total time: 0.004s

PS C:\Users\roma_\OneDrive\Desktop\adb-setup-1.4.3>

Not sure what I did wrong, but it did not go as successfully as yours did.

(oh and yes, downgraded the Zenfone 8 to Android 11).

Any thoughts here would be appreciated.

Thomas
 

Adaoh

Senior Member
Jun 13, 2021
126
61
ASUS ZenFone 8
Hi Tyzio,

Finally got time to implement this, and followed your step by step process .... definitely made some progress I believe with the ADB Installer v1.4.3 and installed across the laptop.

Put the phone into fastboot, with USB Debugging and this is what I got:

PS C:\Users\roma_\OneDrive\Desktop\adb-setup-1.4.3> fastboot devices
M4AIB7626606MH7 fastboot
PS C:\Users\roma_\OneDrive\Desktop\adb-setup-1.4.3> fastboot flashing lock
...
FAILED (remote: Unrecognized command flashing lock)
finished. total time: 0.004s
PS C:\Users\roma_\OneDrive\Desktop\adb-setup-1.4.3> fastboot oem asus-csc
...
FAILED (remote: Command not supported in default implementation)
finished. total time: 0.005s
PS C:\Users\roma_\OneDrive\Desktop\adb-setup-1.4.3> fastboot oem asus-csc_lk
...
FAILED (remote: Command not supported in default implementation)
finished. total time: 0.004s

PS C:\Users\roma_\OneDrive\Desktop\adb-setup-1.4.3>

Not sure what I did wrong, but it did not go as successfully as yours did.

(oh and yes, downgraded the Zenfone 8 to Android 11).

Any thoughts here would be appreciated.

Thomas
2 things I could recommend is moving the platform-tools to your local computer instead of OneDrive, this can sometimes cause problems (I see you are in a OneDrive directory, network drives have caused me other issues in the past). Also, try running your console/and prompt as Administrator, maybe it is a permission problem, even though the error code does not refer to that.

Also quick tip, you can just type adb reboot bootloader to go in the required mode for locking.

Hope some part of this helps
 

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    Hi,

    I had the same problem as you, couldn't use Google pay.

    All I did was open powershell and use the following command.

    fastboot oem asus-csc_lk

    Now it's relocked and works as before.

    Hope this helps you.

    Craig
    2
    No OTAs, no warranty, no google payments back.... Indeed now i can manually update software just placing the file in the root storage.
    Google payments are ok with no root.
    OTA and warranty - forget about those :)
    Yes, you can install update file by just placing .zip update in internal storage.
    1
    I'd appreciate it someone could provide instructions for a numpty, in a manner that the numpty (myself) can understand.

    I unlocked the Bootloader on my Asus Zenfone 8 with a view to flash the stable version of Android 12.

    My mistake was not having enough skill to 1. Flash Android 12 and 2 relock the Bootloader. I unlocked the Bootloader by using the official method from the Asus site.

    Oh yes, I also retrospectively realised that I lost the ability to use Google Pay and Netflix. Oh, and I may not gain any OTA updates as well.

    I've read and re-read countless articles and tried to follow many "how to's" but not being successful ... to me, it seems I'm missing a common sense step that everyone knows so well, that they feel doesn't need to be included in the how to's.

    So I'm seeking a fool proof step by step guide for numpties (me) or someone who could step me through it
    via DM.

    I'm pretty much at the point to pay someone to assist me and sort out my Zenfone with Android 12 and a relocked bootloader.

    Thank you in advance for any assistance.

    Thomas
    1
    Hi $cronos_,

    What is a GSI please? As mentioned at the start of my post, the simpler and more detailed the reply the better as I'm the numpty and happy to admit to that.

    Thank you

    Thomas
    generic system image
    1
    Hi Adaoh,

    So what you're saying is to follow this link and take me to an older Android 11 version but then flash the most recent Android 11 version, then flash Android 12?

    Question for you that has stumped me .... most people on forums and websites quickly gloss over flashing of an Operating System but don't actually go through the exact every step .... are you able to assist here please?

    Again, as per the start of my post, I'm the numpty and happy to admit that, but do need to know comprehensively each and every step.

    Thank you in advance,

    Thomas

    Updating from an update file​

    Ok, so to update your phone when you can't receive OTAs:
    1. Download the version that you need from the Asus Zenfone 8 Support page
    2. Plug in your phone to your computer, make sure the computer is trusted and that you can transfer files from the PC to the phone.
    3. Move the zip file of the update in the base directory of the phone (The same directory as Alarms, Downloads, etc).
    4. Wait for the transfer to finish, then you can unplug your phone if you want.
    5. Reboot the phone
    6. After the reboot, the phone will take a few seconds/minutes and will notify you that an update file was found, select the option to update the phone
    7. It will then extract the update and install it all by itself, the normal update procedure starts from there

    Flashing the Stock ROM (Android 11)​

    Note: doing this will remove any data on your phone, back it up if it is important to you​

    This also works if your phone is stuck in a bootloop or other problems of the sort
    If your question was about the flashing of Android 11 from the Android12 page with the older version, the instructions on the page at the bottom should be enough, but I can try to make them clearer.
    1. Turn off the phone
    2. When the phone is off, press and hold the Volume Up key and the Power button until a screen pops up.
      • If the phone boots to Android, shut it back off, but this time try lifting the Power button before the Volume Up key, because the power button is like an Enter key, it will take it as if you clicked "yes, continue to android".
    3. Plug the phone in your computer
    4. Decompress the zip file on your computer
    5. Execute the script file that is made for your computer
      • Windows: update_image.bat
      • Ubuntu: update_image.sh
      • MacOS: update_image_for_mac.sh
    6. Wait for the process to finish, it'll take a while. You'll know it is done when the window that openned when you executed one of the script files says something along the lines of "Flashing done, press Enter to reboot"
    I hope this helps!