Warning: The provided instructions are for LineageOS 21. These will 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 and fastboot. Setup instructions can be found here.
Make sure that your model number is one of the following (exact match required!):
SM-G781B
SM-G781B/DS
Boot your device with the stock OS at least once and check every functionality.
LineageOS is provided as-is with no warranty. While we attempt to verify everything works you are installing this at your own risk!
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Warning: Before following these instructions please ensure that the device is currently using
Android 13 firmware.
If the vendor provided multiple updates for that version, e.g. security updates, make sure you are on the latest!
If your current installation is newer or older than Android 13, please upgrade or downgrade to the required version before proceeding
(guides can be found on the internet!).
Checking the correct firmware
Installation on your device requires a specific firmware version to be installed before you continue.
Firmware refers to a device-specific set of images that are included in, and updated by the stock OS
LineageOS builds for this device require an Android 13 version of the stock OS to be installed prior to following the installation guide
Please ensure that you are checking the Android version, and not the vendor OS version
Being on another custom ROM, including unofficial builds of the same version of LineageOS, does not ensure that this requirement has been fulfilled
Please re-read this section as many times as necessary to fully understand the requirements
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Note:
If you are unsure what firmware version you are currently on, we strongly recommend returning to the corresponding stock OS before following the installation guide!
Failing to install the correct firmware version prior to installation may result in failure to install LineageOS, unexpected crashes post-installation,
or permanent damage to your device!
Pre-Install Instructions
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Warning: The following instructions will unlock the bootloader and wipe all userdata on the device.
Connect the device to a Wi-Fi network.
Enable Developer Options by pressing the “Build Number” option at least 7 times, in the “Settings” app within the “About” menu
From within the Developer options menu, enable OEM unlock.
Run Odin3 v3.13.1 found in the newly extracted “Odin_3.13.1” folder.
Check the box labeled next to the button labeled “AP”, and then click the “AP” button.
In the menu that pops up, select the newly created custom VBMeta .tar file.
Power off the device, and again boot it into download mode:
With the device powered off, hold Volume Up + Volume Down and connect USB cable to PC.
Check in the top left of the Odin window that you see a valid device, it will show up as something like COM0.
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Tip: The COM port, or the number succeeding COM, may be any valid number.
Click “Start”. A transfer bar will appear on the device showing the VBMeta image being flashed.
Your device will reboot, you may now unplug the USB cable from your device.
The device will demand you factory reset, please follow the onscreen instructions to do so.
Run through Android Setup skipping everything you can, then connect the device to a Wi-Fi network.
Re-enable Development settings by clicking the “Build Number” option 10 times, in the “Settings” app within the “About” menu, and verify that “OEM Unlock” is still enabled in the “Developer options” menu.
Important Information
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Note: The following instructions require a machine running Windows 10 build 17063 or newer.
Samsung devices come with a unique boot mode called “Download mode”, which is very similar to “Fastboot mode” on some devices with unlocked bootloaders.
Odin is a Samsung-made tool for interfacing with Download mode on Samsung devices.
The preferred method of installing a custom recovery is through Download Mode – rooting the stock firmware is neither necessary nor required.
Installing Lineage Recovery using Odin
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Note: If this device’s install instructions already had you download Odin/Enable OEM Unlocking earlier in the installation process, you can skip the steps for enabling OEM Unlock, as well as for downloading and extracting the drivers and Odin.
Enable Developer Options by pressing the “Build Number” option 10 times, in the “Settings” app within the “About” menu
From within the Developer options menu, enable OEM unlock.
Build a LineageOS installation package. The recovery will be built as part of it!
Locate the built recovery.img file, open a Command Prompt in the folder where the file was found, and TAR the file by running tar --format=ustar -cvf recovery.tar recovery.img
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Tip: You can open a command prompt in any folder by right-clicking on empty space while holding Shift and selecting “Open Command Prompt here” or “Open PowerShell window here” from the context menu.
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Important: Other recoveries may not work for installation or updates. We strongly recommend to use the one linked above!
Power off the device, and boot it into download mode:
With the device powered off, hold Volume Up + Volume Down and connect USB cable to PC.
Now, click the button that the onscreen instructions correlate to “Continue”, and insert the USB cable into the device.
Run Odin3 v3.13.1 found in the newly extracted “Odin_3.13.1” folder.
Check in the top left of the Odin window that you see a valid device, it will show up as something like COM0.
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Tip: The COM port, or the number succeeding COM, may be any valid number.
In the left side of the Odin window, you will see an “Options” tab, click it, and then un-check the “Auto Reboot” option.
Check the box labeled next to the button labeled “AP”, and then click the “AP” button.
In the menu that pops up, select the newly downloaded (or built) custom recovery .tar or .tar.md5.
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Tip: The filename may vary depending on your device, and the version of your custom recovery.
Click “Start”. A transfer bar will appear on the device showing the recovery image being flashed.
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Note: The device will continue to display Downloading... Do not turn off target!! even after the process is complete.
Manually reboot into recovery, this may require pulling the device’s battery out and putting it back in, or if you have a non-removable battery, press the Volume Down + Power buttons for 8~10 seconds until the screen turns black & release the buttons immediately when it does, then boot to recovery:
With the device powered off, hold Volume Up + Power while the device is connected to a PC via USB cable.
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Note: Be sure to reboot into recovery immediately after installing the custom recovery. If you don’t the custom recovery will be overwritten on boot.
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Note:
If your recovery does not show the LineageOS logo
, you accidentally booted into the wrong recovery. Please start at the top of this section!
With the device powered off, hold Volume Up + Power while the device is connected to a PC via USB cable.
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 but do not reboot before you read/followed the rest of the instructions!
On the device, select “Apply Update”, then “Apply from ADB” to begin sideload.
On the host machine, sideload the package using: adb -d 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 or adb: failed to read command: Undefined error: 0 which is also fine.
Installing Add-Ons
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Note: If you don’t want to install any add-on (such as Google Apps), you can skip this whole section!
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Warning:
If you want to install Google Apps add-on package (use the arm64 architecture), you can download it from here.
This add-on needs to be installed before booting into LineageOS for the first time!
Click Apply Update, then Apply from ADB, then adb -d sideload filename.zip for all desired packages in sequence.
When presented with a screen that says Signature verification failed, click Yes. It is expected as add-ons aren’t signed with LineageOS’s official key!
All set!
Once you have installed everything successfully, you can now reboot your device into the OS for the first time!
Click the back arrow in the top left of the screen, then “Reboot system now”.
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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.