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Install LineageOS on
ASUS ROG Phone 2 (ZS660KL)

I001D

Warning: The provided instructions are for LineageOS 17.1. 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.
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 currently using Android 10 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 10, please upgrade or downgrade to the required version before proceeding (guides can be found on the internet!).

Unlocking the bootloader

Note: The steps below only need to be run once per device.

Download the bootloader unlock app for your device:
- Navigate to ASUS’ support site and go to your device’s page by entering its model number.
- Click Driver & Tools.
- Select Android from the drop-down menu.
- Open the Utilities section.
- Download the Unlock Device App.
- If the downloaded file is packaged in a .zip archive, extract it.
Connect the device to your PC via USB.
On the computer, open a command prompt (on Windows) or terminal (on Linux or macOS) window and change to the location where the Unlock Device App .apk resides.
Install the .apk by typing:
```
adb install Name_of_unlock_app.apk
```
- For example, on the ZE551ML device, it would be adb install UnlockApp_ze551ml_20150723.apk.
Run the application Unlock Device Tool from the device and agree to the terms.

Note: After you agree to the terms, the ASUS unlock app might ask you to login with your Google account. If your password does not work, then you need to enable temporary access for less secure apps here. If you have two-factor authentication enabled on your Google account, you will have to generate an individual app password on the Google accounts settings website, as the unlock app does not natively support two-factor.
Press the button to unlock your device.
The device should automatically reboot into bootloader mode and the message unlock successfully...reboot after 5 seconds should be displayed. The device will then reboot and load Android.

Booting a custom recovery using `fastboot`

Build a LineageOS installation package. The recovery will be built as part of it!
Important: Other recoveries may not work for installation or updates. We strongly recommend to use the one linked above!
Connect your device to your PC via USB if it isn’t already.
If your device isn’t already in fastboot mode, 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. Keep holding both buttons until the words “Fastboot Mode” appear on the screen, then release.
Once the device is in fastboot mode, verify your PC finds it by typing:
```
fastboot devices
```
If you don’t get any output or an error:
- on Windows: make sure the device appears in the device manager without a triangle. Try other drivers until the command above works!
- on Linux or macOS: If you see no permissions fastboot try running fastboot as root. When the output is empty, check your USB cable (preferably use a USB Type-A 2.0 one or a USB hub) and port!
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.
Flash a recovery on your device by typing (replace <recovery_filename> with the actual filename!):
```
fastboot flash boot <recovery_filename>.img
```
Note: Outdated fastboot releases dropped legacy A/B support, so it might attempt to flash to boot__a / boot__b rather than boot_a / boot_b if you try to flash boot. In this case, you must update fastboot to a release newer than or equal to 31.0.2. Alternatively, you can manually specify which slot to flash to based on what slot fastboot failed to flash to. For example, if fastboot fails to flash to boot__a, you must flash to boot_a.
Now reboot into recovery to verify the installation.
- With the device powered off, hold Volume Up + Power. Keep holding both buttons until the words “Fastboot Mode” appear on the screen, then release. Now with the volume rocker select “Recovery mode”, then press Power.
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!

Ensuring all firmware partitions are consistent

Note: The steps below only need to be run once per device.

In some cases, the inactive slot can be unpopulated or contain much older firmware than the active slot, leading to various issues including a potential hard-brick. We can ensure none of that will happen by copying the contents of the active slot to the inactive slot.

To do this, sideload the copy-partitions-20220613-signed.zip package by doing the following:

Download the copy-partitions-20220613-signed.zip file from here. It should have a MD5 sum of 79f2f860830f023b7030c29bfbea7737 or a SHA-256 sum of 92f03b54dc029e9ca2d68858c14b649974838d73fdb006f9a07a503f2eddd2cd.
Sideload the copy-partitions-20220613-signed.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 copy-partitions-20220613-signed.zip
Note: The copy-partitions script was created by LineageOS developer erfanoabdi and filipepferraz
Now reboot to recovery by tapping “Advanced”, then “Reboot to 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 arm64 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, hold Volume Up + Power. Keep holding both buttons until the words “Fastboot Mode” appear on the screen, then release. Now with the volume rocker select “Recovery mode”, then press Power.
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 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.

Installing Add-Ons

Note: If you don’t want to install any add-on (such as Google Apps), you can skip this whole section!

Warning: If you want the Google Apps add-on on your device, you must follow this step before booting into LineageOS for the first time!

Even though you are already in recovery, click Advanced, then Reboot to Recovery
When your device reboots, click Apply Update, then Apply from ADB, then adb sideload filename.zip for all desired 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.

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”.

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.

Install LineageOS on ASUS ROG Phone 2 (ZS660KL)