Thursday, May 29, 2025

How to Install LineageOS on OnePlus 12R

Transform your OnePlus 12R into a bloatware-free, privacy-focused powerhouse with this detailed guide to installing LineageOS, the ultimate custom ROM for Android customization.

Why Install LineageOS on Your OnePlus 12R?

LineageOS is a renowned custom ROM that offers a clean, near-stock Android experience without the bloatware found in OxygenOS. It provides enhanced privacy controls, regular security updates, and extensive customization options, making it ideal for OnePlus 12R users seeking to optimize their device. Based on Android 15, LineageOS 22 brings the latest features to your OnePlus 12R, extending its lifespan and performance. This guide walks you through the process of flashing LineageOS on your OnePlus 12R, ensuring a smooth and safe installation.

Whether you're a tech enthusiast or a beginner, this OnePlus 12R custom ROM guide is designed to be clear and actionable. Let’s get started!

Prerequisites for LineageOS Installation

Before diving into the LineageOS installation, gather these essentials to ensure a seamless process:

  • OnePlus 12R running OxygenOS 15.0.0.300 (EX01) or higher (check in Settings > About Phone). For OnePlus Ace 3 users, convert to OxygenOS first using Oxygen Updater.
  • Computer with Windows, macOS, or Linux.
  • USB-C cable (preferably the official OnePlus cable).
  • ADB and Fastboot tools installed on your computer (download from Google’s SDK Platform Tools page).
  • LineageOS ROM for OnePlus 12R (download from the XDA Forums or unofficial sources, as official support may be limited).
  • LineageOS Recovery (boot.img and vendor_boot.img, available from the same source as the ROM).
  • Optional: Google Apps (GApps) package for ARM64 Android 15 (e.g., MindTheGapps or OpenGApps).
  • Backup of all data, as unlocking the bootloader will wipe your device.

Warning: Unlocking the bootloader voids your warranty and erases all data. Back up your photos, contacts, and files to a secure location (e.g., Google Drive or a computer) before proceeding. Remove any lockscreen passwords to avoid issues during flashing.

Step-by-Step Guide to Install LineageOS on OnePlus 12R

Follow these steps carefully to flash LineageOS on your OnePlus 12R. This guide accounts for the device’s A/B partition system to prevent bootloops and ensure a successful Android customization experience.

Step 1: Back Up Your Data

Unlocking the bootloader will erase all data on your OnePlus 12R. Back up your photos, videos, contacts, and apps to Google Drive, a computer, or an external storage device. Double-check that your backup is complete before proceeding.

Step 2: Update to the Latest OxygenOS Firmware

LineageOS for OnePlus 12R requires OxygenOS 15.0.0.300 (EX01) or higher for compatibility. Check your firmware version in Settings > About Phone. If you’re on a lower version, update using Oxygen Updater or the official OTA in Settings > System > System Update. For OnePlus Ace 3 users, convert to OxygenOS first using Oxygen Updater to ensure compatibility.

Note: Flash the same OxygenOS update to both A/B slots to avoid bricking. Run the update twice if already on the required version to ensure both slots are synchronized.

Step 3: Enable Developer Options and USB Debugging

To allow your computer to communicate with your OnePlus 12R:

  1. Go to Settings > About Phone.
  2. Tap Build Number seven times to unlock Developer Options.
  3. Navigate to Settings > System > Developer Options.
  4. Enable USB Debugging and OEM Unlocking.

Step 4: Install ADB and Fastboot

Download Google’s SDK Platform Tools from their official site and extract them to a folder (e.g., C:\platform-tools on Windows). Add this folder to your system’s PATH for easy command-line access. This setup is crucial for flashing your OnePlus 12R custom ROM.

Step 5: Unlock the Bootloader

Unlocking the bootloader is a critical step for installing LineageOS:

  1. Power off your OnePlus 12R.
  2. Enter fastboot mode by holding Volume Up + Power until the fastboot screen appears.
  3. Connect your device to your computer via USB-C.
  4. Open a command prompt or terminal in the platform-tools folder.
  5. Type fastboot devices to verify your device is detected.
  6. Run fastboot oem unlock. Confirm the unlock on your device’s screen using the volume and power buttons.

Warning: This step erases all data. Ensure your backup is complete. Unlocking the bootloader may cause apps like Netflix or Google Pay to detect an unlocked state, potentially limiting functionality.

Step 6: Download LineageOS and Recovery Files

Since official LineageOS support for the OnePlus 12R may be limited, visit the XDA Forums for unofficial builds compatible with your device (codename: CPH2585 for 12R or ACE 3 for some variants). Download the LineageOS 22 ZIP file (based on Android 15) and the LineageOS Recovery files (boot.img and vendor_boot.img). Optionally, download a GApps package (e.g., MindTheGapps for ARM64 Android 15) if you want Google Play Store. Move all files to the platform-tools folder.

(https://xdaforums.com/t/rom-15-unofficial-lineageos-for-oneplus-12r-ace-3-04-04-25.4669911/)

Note: Use unofficial builds cautiously, as they may have less support. Verify the source’s credibility (e.g., XDA’s OnePlus 12R development thread) to avoid malicious files.

Step 7: Flash LineageOS Recovery

Flash the custom recovery to your OnePlus 12R:

  1. With your device in fastboot mode, run:
    fastboot flash boot boot.img
    fastboot flash vendor_boot vendor_boot.img
  2. Reboot to recovery by selecting “Recovery Mode” using the volume keys and pressing the power button.

Step 8: Factory Reset

In LineageOS Recovery, select Factory Reset > Format Data/Factory Reset. Confirm the wipe to clear data, cache, and system partitions. This ensures a clean install and removes encryption from OxygenOS.

Step 9: Flash LineageOS ROM

Install the LineageOS ROM via ADB sideload:

  1. In LineageOS Recovery, select Apply Update > Apply from ADB.
  2. On your computer, run:
    adb sideload lineage-22.0-xxxxxxxx-nightly-cph2585-signed.zip
    (Replace with the actual filename of the LineageOS ZIP).
  3. Wait for the sideload to complete. It may pause at 47%, which is normal.

Step 10: Flash GApps (Optional)

If you want Google apps, flash the GApps package:

  1. Reboot to recovery from the recovery menu (Advanced > Reboot to Recovery).
  2. Select Apply Update > Apply from ADB.
  3. Run:
    adb sideload MindTheGapps-15.0.0-arm64-xxxxxxxx.zip
    (Replace with the actual GApps filename).
  4. Ignore any “Signature verification failed” warnings, as this is expected.

Step 11: Reboot and Set Up

In LineageOS Recovery, select Reboot system now. The first boot may take up to 15 minutes. Once booted, complete the on-screen setup to configure your OnePlus 12R with LineageOS. Enjoy your bloatware-free, privacy-focused Android experience!

(https://wiki.lineageos.org/devices/enchilada/install/)

Tips for Optimizing Your LineageOS Experience

  • Customization: Dive into LineageOS settings to tweak themes, gestures, and privacy options for a personalized OnePlus 12R experience.
  • Community Support: Join the LineageOS subreddit, Discord's OnePlus 12R thread for troubleshooting and tips.
    • (https://wiki.lineageos.org/devices/enchilada/install/)
  • Backup Regularly: Use LineageOS Recovery to create backups before applying updates or modifying the system.

Common Issues and Fixes

If you encounter problems during the LineageOS installation:

  • Device Not Detected: Ensure USB drivers are installed and USB debugging is enabled. Try a different USB cable or port.
  • Bootloop: Reboot to recovery and reflash the ROM. Ensure both A/B slots have the same OxygenOS firmware version.

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