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Install LineageOS on
ASUS ZenFone 8

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Warning: The provided instructions are for LineageOS 20. These will only work if you follow every section and step precisely.
Do not continue after something fails!

Basic requirements

Read through the instructions at least once before actually following them, so as to avoid any problems due to any missed steps!
Make sure your computer has adb and fastboot. Setup instructions can be found here.
Enable USB debugging on your device.
Make sure that your model is actually listed in the “Supported models” section here (exact match required!)
Boot your device with the stock OS at least once and check every functionality.
Warning: Make sure that you can send and receive SMS and place and receive calls (also via WiFi and LTE, if available), otherwise it won’t work on LineageOS either! Additionally, some devices require that VoLTE/VoWiFi be utilized once on stock to provision IMS.
LineageOS is provided as-is with no warranty. While we attempt to verify everything works you are installing this at your own risk!

Warning: Before following these instructions please ensure that the device is currently using Android 13 firmware.
If the vendor provided multiple updates for that version, e.g. security updates, make sure you are on the latest!
If your current installation is newer or older than Android 13, please upgrade or downgrade to the required version before proceeding (guides can be found on the internet!).

Checking the correct firmware

Installation on your device requires a specific firmware version to be installed before you continue.

Firmware refers to a device-specific set of images that are included in, and updated by the stock OS
LineageOS builds for this device require an Android 13 version of the stock OS to be installed prior to following the installation guide
Please ensure that you are checking the Android version, and not the vendor OS version
Being on another custom ROM, including unofficial builds of the same version of LineageOS, does not ensure that this requirement has been fulfilled
Please re-read this section as many times as necessary to fully understand the requirements

Note: If you are unsure what firmware version you are currently on, we strongly recommend returning to the corresponding stock OS before following the installation guide!

Failing to install the correct firmware version prior to installation may result in failure to install LineageOS, unexpected crashes post-installation, or permanent damage to your device!

Unlocking the bootloader

Important: An official method of unlocking the bootloader is not available, but there may be some unofficial methods available. Unofficial methods are not recommended or supported by LineageOS, so use them at your own risk! An unlocked bootloader is required to install LineageOS.

Flashing additional partitions

Warning: This platform requires additional partitions to be flashed for recovery to work properly, the process to do so is described below.

Download the following files from here.
- vendor_boot.img
Power off the device, and boot it into bootloader mode:
- With the device powered off, hold Volume Up + Volume Down + Power.
Flash the downloaded image files to your device by typing:
```
fastboot flash vendor_boot vendor_boot.img
```

Installing Lineage Recovery using `fastboot`

Download Lineage Recovery. Simply download the latest recovery file, named boot.img.
Important: Other recoveries may not work for installation or updates. We strongly recommend to use the one linked above!
Flash recovery onto your device:
```
fastboot flash boot boot.img
```
Now reboot into recovery to verify the installation.
- Use the menu to navigate to and to select the Recovery option.
Note: If your recovery does not show the LineageOS logo , you accidentally booted into the wrong recovery. Please start at the top of this section!

Installing LineageOS from recovery

Download the LineageOS zip file that you would like to install or build the package yourself.
If you are not in recovery, reboot into recovery:
- With the device powered off, hold Volume Up + Power. Then select recovery from bootloader using the hardware keys.
Now tap Factory Reset, then Format data / factory reset and continue with the formatting process. This will remove encryption and delete all files stored in the internal storage, as well as format your cache partition (if you have one).
Return to the main menu.
Sideload the LineageOS .zip package but do not reboot before you read/followed the rest of the instructions!
- On the device, select “Apply Update”, then “Apply from ADB” to begin sideload.
- On the host machine, sideload the package using: adb -d sideload filename.zip.
  Tip: After the package is installed, recovery will inform you that reboot to recovery is required to install add-ons. In case you want to do that, please select “Yes,” otherwise “No”.
  
  Tip: Normally, adb will report Total xfer: 1.00x, but in some cases, even if the process succeeds the output will stop at 47% and report adb: failed to read command: Success. In some cases it will report adb: failed to read command: No error or adb: failed to read command: Undefined error: 0 which is also fine.

Installing Add-Ons

Note: If you don’t want to install any add-on (such as Google Apps), you can skip this whole section!

Warning: If you want to install Google Apps add-on package (use the arm64 architecture), you can download it from here. This add-on needs to be installed before booting into LineageOS for the first time!

Click Apply Update, then Apply from ADB, then adb -d sideload filename.zip for all desired packages in sequence.
When presented with a screen that says Signature verification failed, click Yes. It is expected as add-ons aren’t signed with LineageOS’s official key!

All set!

Once you have installed everything successfully, you can now reboot your device into the OS for the first time!

Click the back arrow in the top left of the screen, then “Reboot system now”.

Note: The first boot usually takes no longer than 15 minutes, depending on the device. If it takes longer, you may have missed a step, otherwise feel free to get assistance.

Get assistance

After you’ve double checked that you followed the steps precisely, didn’t skip any and still have questions or got stuck, feel free to ask on our subreddit or in #LineageOS on Libera.Chat.

Install LineageOS on ASUS ZenFone 8