Unlocking the bootloader

  1. Dial *#*#7378423#*#* (*#*#SERVICE#*#*) to launch the service menu.
  2. Go to service info > configuration and check “rooting status” - you can only continue if it says Bootloader unlock allowed: Yes.
  3. Make sure your computer has working fastboot and adb.
  4. Enable USB debugging on your device.
  5. Get the current status of your bootloader:

    Open a terminal on the PC and boot the device to fastboot mode by typing:

     adb reboot bootloader
    

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

    • With the device powered down, hold Volume Up and connect the USB cable. The notification light should turn blue.

    Once the device is in fastboot mode, verify your PC detects it by typing:

     fastboot devices
    

    If you see no permissions fastboot or <waiting for device>, try running fastboot as root/Administrator.

  6. Follow the instructions on developer.sonymobile.com to unlock your bootloader.

Installing a custom recovery using fastboot

  1. Make sure your computer has working fastboot and adb.
  2. Enable USB debugging on your device.
  3. Download recovery - visit twrp.me to obtain the latest version of Team Win Recovery Project for your device.
  4. Connect your device to your PC via USB.
  5. Open a terminal on the PC and boot the device to fastboot mode by typing:

     adb reboot bootloader
    

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

    • With the device powered down, hold Volume Up and connect the USB cable. The notification light should turn blue.
  6. Once the device is in fastboot mode, verify your PC finds it by typing:

     fastboot devices
    

    If you see no permissions fastboot or <waiting for device>, try running fastboot as root/Administrator.

  7. Flash recovery onto your device:

     fastboot flash recovery your_recovery_img.img
    
  8. Now reboot into recovery to verify the installation:
    • On boot, press Volume Down when the LEDs start lighting up.
      Second Recovery: To boot the FOTA Recovery, press Volume Up instead.

Installing LineageOS from recovery

  1. Make sure your computer has working adb. Setup instructions can be found here.

  2. Download the LineageOS install package that you’d like to install or build the package yourself.

    • Optionally, download 3rd party application packages like Google Apps
  3. Place the LineageOS .zip package, as well as any other .zip packages on the root of /sdcard:
    • Using adb: adb push filename.zip /sdcard/
    • You can use any method you are comfortable with. adb is universal across all devices, and works both in Android and recovery mode, providing USB debugging is enabled.
  4. If you aren’t already in recovery, boot into recovery:
    • On boot, press Volume Down when the LEDs start lighting up.
      Second Recovery: To boot the FOTA Recovery, press Volume Up instead.
  5. (Optional, but recommended): Select the Backup button to create a backup.
  6. Select Wipe and then Advanced Wipe.
  7. Select Cache, System and Data partitions to be wiped and then Swipe to Wipe.
  8. Go back to return to main menu, then select Install.
  9. Navigate to /sdcard, and select the LineageOS .zip package.
  10. Follow the on-screen prompts to install the package.
  11. (Optional): Install any additional packages using the same method.
  12. (Optional): Root the device by installing the LineageOS su add-on (use the arm package) or using any other method you prefer.
  13. Once installation has finished, return to the main menu, select Reboot, and then System.

Get assistance

If you have any questions, or get stuck on any of the steps, feel free to ask on our subreddit, or in #LineageOS on freenode.