Install LineageOS on mdarcy_tab

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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. Connect the device to your PC via USB.
  2. On the computer, open a command prompt (on Windows) or terminal (on Linux or macOS) window, and type:
    adb reboot bootloader
    
  3. 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 and port!
  4. Now type the following command to unlock the bootloader:

    fastboot oem unlock
    
  5. If the device doesn’t automatically reboot, reboot it. It should now be unlocked.
  6. Since the device resets completely, you will need to re-enable USB debugging to continue.

Installing a custom recovery using fastboot

  1. Download Lineage Recovery. Simply download the latest recovery file, named something like lineage-17.1-20220515-recovery-mdarcy_tab.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
    
  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 and port!
  5. Flash recovery onto your device (replace <recovery_filename> with the actual filename!):
    fastboot flash recovery <recovery_filename>.img
    
  6. Now reboot into recovery to verify the installation. Do not reboot into the existing OS, since it will overwrite the recovery you just installed!
    • With the device powered off, plug the included Shield controller into the USB-A port on the back of the device. Next, hold the A button and B button while plugging the device into power, continue until a menu is displayed. Tap the Y button until “Boot recovery kernel” is selected. Now, press the A button to select this option.

Installing LineageOS from recovery

  1. Build a LineageOS installation package.
    • (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, plug the included Shield controller into the USB-A port on the back of the device. Next, hold the A button and B button while plugging the device into power, continue until a menu is displayed. Tap the Y button until “Boot recovery kernel” is selected. Now, press the A button to select this option.
  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, repeat the sideload steps above for 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.