Install LineageOS on d801

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Warning: These instructions 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. Setup instructions can be found here.
Enable USB debugging on your device.
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 on the latest firmware available, that is Android Lollipop (5.0.2)

Rooting your device

Important: The device must be rooted before proceeding any further.

Root your device by following this guide.

Downgrading bootloader

In order to be able to boot a custom recovery and LineageOS you need to downgrade your bootloader.

Download the relevant files for your device variant from here.

Place aboot.bin and laf.bin on the root of /sdcard:

Using adb:

adb push aboot.bin /sdcard/aboot.bin
adb push laf.bin /sdcard/laf.bin

Now, open an adb shell from a command prompt (on Windows) or terminal (on Linux or macOS) window. In that shell, type the following commands:

su
dd if=/sdcard/aboot.bin of=/dev/block/platform/msm_sdcc.1/by-name/aboot
dd if=/sdcard/laf.bin of=/dev/block/platform/msm_sdcc.1/by-name/laf
exit
exit

Important: Do NOT shut down or reboot your device now, because you will not be able to boot again until you finish these instructions!

Installing a custom recovery using `dd`

Build a LineageOS installation package. The recovery will be built as part of it!
Place the recovery image file on the root of /sdcard:
- Using adb: adb push <recovery_filename>.img /sdcard/<recovery_filename>.img
Tip: The file may not be named identically to what stands in this command, so adjust accordingly.
- 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.
Now, open an adb shell from a command prompt (on Windows) or terminal (on Linux or macOS) window. In that shell, type the following commands:
```
su
dd if=/sdcard/<recovery_filename>.img of=/dev/block/platform/msm_sdcc.1/by-name/recovery
```
Reboot into recovery.
- From the same shell, type the following command:
```
reboot recovery
```

Installing LineageOS from recovery

Build a LineageOS installation package.
- (Optionally): If you want to install an application package add-on such as Google Apps (use the arm architecture), please read and follow the instructions on Google Apps page
If you are not in recovery, reboot into recovery:
- With the device powered off and usb unplugged, hold Volume Down + Power. When the LG logo appears, release both buttons and hold Volume Up + Volume Down.
  
  Note: Accept the factory reset prompt using the hardware buttons. If you have done everything correctly, this will not actually reset your device but instead will boot the custom recovery.
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:
- 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.
  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.
(Optionally): If you want to install any add-ons, repeat the sideload steps above for those packages in sequence.

Note: Add-ons aren’t signed with LineageOS’s official key, and therefore when they are sideloaded, Lineage Recovery will present a screen that says Signature verification failed, this is expected, please click Continue.

Note: If you want the Google Apps add-on on your device, you must follow this step before booting into LineageOS for the first time!
Once you have installed everything successfully, 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.