Install LineageOS on h850

Basic requirements

1. Make sure your computer has adb and fastboot. Setup instructions can be found here.
2. Enable USB debugging on your device.

Unlocking the bootloader

Installing a custom recovery using fastboot

1. Download a custom recovery - you can download Lineage Recovery. Simply download the latest recovery file, named something like lineage-18.1-20220112-recovery-h850.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 + Power.
4. Once the device is in fastboot mode, verify your PC finds it by typing:

   fastboot devices
   

   check

   Tip: If you see no permissions fastboot while on Linux or macOS, try running fastboot as root.
5. Flash recovery onto your device:

   fastboot flash recovery <recovery_filename>.img
   

   check

   Tip: The file may not be named identically to what stands in this command, so adjust accordingly.
   check

   Tip: Some devices have buggy USB support while in bootloader mode, if you see fastboot hanging with no output when using commands such as fastboot getvar ..., fastboot boot ..., fastboot flash ... you may want to try a different USB port (preferably a USB Type-A 2.0 one) or a USB hub.
6. Now reboot into recovery to verify the installation:
   • With the device powered off, hold Volume Down + Power until the LG logo appears, then release Power for a second and hold it again until the recovery comes up.

Installing LineageOS from recovery

1. Download the LineageOS installation package that you would like to install or build the package yourself.
   • Optionally, download an application package add-on such as Google Apps (use the arm64 architecture).
2. If you are not in recovery, reboot into recovery:

   • With the device powered off, hold Volume Down + Power until the LG logo appears, then release Power for a second and hold it again until the recovery comes up.

     info_outline

     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.
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.
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     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 which is also fine.

6. (Optionally): If you want to install any add-ons, repeat the sideload steps above for those packages in sequence.

   info_outline

   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.
   info_outline

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

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 Libera.Chat.