Install LineageOS on sake

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Basic requirements

  1. Read through the instructions at least once before actually following them, so as to avoid any problems due to any missed steps!
  2. Make sure your computer has adb and fastboot. Setup instructions can be found here.
  3. Enable USB debugging on your device.
  4. Make sure that your model is actually listed in the “Supported models” section here (exact match required!)

Unlocking the bootloader

  1. Download the bootloader unlock app for your device:

    • Navigate to ASUS’ support site and go to your device’s page by entering its model number.
    • Click Driver & Tools.
    • Select Android from the drop-down menu.
    • Open the Utilities section.
    • Download the Unlock Device App.
    • If the downloaded file is packaged in a .zip archive, extract it.
  2. Connect the device to your PC via USB.
  3. On the computer, open a command prompt (on Windows) or terminal (on Linux or macOS) window and change to the location where the Unlock Device App .apk resides.
  4. Install the .apk by typing:
    adb install Name_of_unlock_app.apk
    
    • For example, on the ZE551ML device, it would be adb install UnlockApp_ze551ml_20150723.apk.
  5. Run the application Unlock Device Tool from the device and agree to the terms.

  6. Press the button to unlock your device.
  7. The device should automatically reboot into bootloader mode and the message unlock successfully...reboot after 5 seconds should be displayed. The device will then reboot and load Android.

Flashing the vendor boot partition

  1. Download vendor_boot file from here. Download the file named vendor_boot.img from the directory named with the latest date.
  2. Power off the device, and boot it into bootloader mode:
    • With the device powered off, hold Volume Up + Volume Down + Power.
  3. Flash the downloaded image to your device by typing (replace <vendor_boot> with the actual filename!):
    fastboot flash vendor_boot <vendor_boot>.img
    

Temporarily booting a custom recovery using fastboot

  1. Download Lineage Recovery. Simply download the latest recovery file, named something like lineage-19.1-20220627-recovery-sake.img.
  2. Connect your device to your PC via USB.
  3. On the computer, open a command prompt (on Windows) or terminal (on Linux or macOS) window, and type:
    adb reboot bootloader
    

    You can also boot into fastboot mode via a key combination:

    • With the device powered off, hold Volume Up + Volume Down + Power.
  4. Once the device is in fastboot mode, verify your PC finds it by typing:
    fastboot devices
    

    If you don’t get any output or an error:

    • on Windows: make sure the device appears in the device manager without a triangle. Try other drivers until the command above works!
    • on Linux or macOS: If you see no permissions fastboot try running fastboot as root. When the output is empty, check your USB cable (preferably use a USB Type-A 2.0 one or a USB hub) and port!
  5. Temporarily flash a recovery on your device by typing (replace <recovery_filename> with the actual filename!):
    fastboot flash boot <recovery_filename>.img
    
  6. Now reboot into recovery to verify the installation.
    • Use the menu to navigate to and to select the Recovery option.

Installing LineageOS from recovery

  1. Download the LineageOS installation package that you would like to install or build the package yourself.
    • (Optionally): If you want to install an application package add-on such as Google Apps (use the arm64 architecture), please read and follow the instructions on Google Apps page
  2. 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.
  3. 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).
  4. Return to the main menu.
  5. Sideload the LineageOS .zip package:
    • On the device, select “Apply Update”, then “Apply from ADB” to begin sideload.
    • On the host machine, sideload the package using: adb sideload filename.zip.
  6. (Optionally): If you want to install any add-ons, click Advanced, then Reboot to Recovery, then when your device reboots, click Apply Update, then Apply from ADB, then adb sideload filename.zip those packages in sequence.

  7. Once you have installed everything successfully, click the back arrow in the top left of the screen, then “Reboot system now”.

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.