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How to Install LineageOS 14.1 on Sony Xperia M [nicki]

LineageOSrom.net -Install LineageOS on Sony Xperia M a.k.a Nicki. This tutorial is including how to:
1. Unlocking the Sony Xperia M bootloader
2. Installing a custom recovery using fastboot
3. Installing LineageOS to Sony Xperia M from custom recovery
4. Sony Xperia M device info

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 Down and connect the USB cable. The notification light should briefly turn green to indicate you are in flash mode.

    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 Down and connect the USB cable. The notification light should briefly turn green to indicate you are in flash mode.
  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:
    • Press Volume Up when the notification light is pink.

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:
    • Press Volume Up when the notification light is pink.
  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 gapps packages using the same method.
  12. (Optional): Root the device by installing the LineageOS su add-on or using any other method you prefer.
  13. Once installation has finished, return to the main menu, select Reboot, and then System.