How to Root and Install Custom ROM on OnePlus Ace 3 Pro

 Rooting allows you to gain superuser access, and installing a custom ROM can offer enhanced performance, new features, and a unique user interface. This guide will walk you through the complete process of rooting your OnePlus Ace 3 Pro and installing a custom ROM. Whether you want to improve battery life, enhance performance, or personalize the UI, this guide has you covered.

Disclaimer

Please note that rooting your device will void the manufacturer’s warranty and, if not done correctly, could potentially harm your device. Always proceed with caution, ensure your data is backed up, and follow the steps carefully.

Prerequisites

Before getting started, you’ll need a few things ready:

  1. Unlocked Bootloader: Rooting and installing custom ROMs requires unlocking the bootloader.
  2. Custom Recovery (TWRP): TWRP (TeamWin Recovery Project) is a widely used custom recovery for Android devices.
  3. Magisk: This will help you root your device.
  4. Custom ROM: Choose the custom ROM you wish to install (LineageOS, HavocOS, etc.).
  5. ADB and Fastboot Tools: Required for executing commands and communicating with your device.
  6. PC & USB Cable: You'll need a computer and USB cable to interact with your device.
  7. Backup: Rooting and flashing ROMs will erase all data. Ensure you back up all important files.

Step 1: Unlock the Bootloader

Unlocking the bootloader on your OnePlus Ace 3 Pro is the first step in rooting and installing a custom ROM.

1.1 Enable Developer Options

  • Open Settings > About Phone.
  • Scroll to Build Number and tap it seven times until Developer Mode is enabled.
  • Go to Settings > System > Developer Options and enable OEM Unlocking and USB Debugging.

1.2 Boot into Fastboot Mode

  • Power off your OnePlus Ace 3 Pro.
  • Hold down Volume Up + Power simultaneously to enter Fastboot Mode.
  • Connect your phone to your computer using a USB cable.

1.3 Unlock the Bootloader via Fastboot

  • On your PC, navigate to the folder where ADB & Fastboot tools are installed.
  • Open a command prompt (Windows) or terminal (macOS/Linux).
  • Run the following command to check that your device is detected:
    fastboot devices
  • Once confirmed, unlock the bootloader with this command:
    fastboot oem unlock
  • On your phone, use the volume buttons to highlight the option to Unlock Bootloader and press Power to confirm.

This step will wipe your data and unlock the bootloader, after which your device will reboot.

Step 2: Install Custom Recovery (TWRP)

The next step is to install a custom recovery, such as TWRP, which will allow you to root the device and install a custom ROM.

2.1 Download TWRP for OnePlus Ace 3 Pro

  • Download the TWRP image file specific to your device from the official TWRP website.

2.2 Flash TWRP via Fastboot

  • Reboot your device into Fastboot Mode by turning it off and then holding Volume Up and Power simultaneously.

  • Open the command prompt/terminal on your computer and navigate to where you saved the TWRP file.

  • Flash the recovery with the following command:

    fastboot flash recovery twrp.img

    (Replace twrp.img with the name of the recovery file.)

  • Once TWRP is installed, reboot into recovery mode by typing:

    fastboot reboot recovery

Your phone will now boot into TWRP custom recovery.

Step 3: Root Your OnePlus Ace 3 Pro with Magisk

Rooting your OnePlus Ace 3 Pro will give you administrative privileges over the system. Magisk is a popular tool used for this.

3.1 Download Magisk ZIP

  • Download the latest Magisk ZIP file and transfer it to your phone.

3.2 Flash Magisk

  1. In TWRP, choose Install.
  2. Locate and select the Magisk ZIP file.
  3. Swipe to confirm the flash.
  4. Once completed, tap Reboot System.

Your phone will now reboot, and Magisk will provide you root access. You can verify root by installing the Magisk Manager app.

Step 4: Flash a Custom ROM

Once your OnePlus Ace 3 Pro is rooted and you have TWRP installed, you can now proceed to install a custom ROM.

4.1 Download the Custom ROM

  • Download a custom ROM (e.g., LineageOS, Pixel Experience, or others) that is compatible with the OnePlus Ace 3 Pro and place it in your phone's storage.

4.2 Boot into TWRP Recovery

  • Turn off your phone.
  • Boot into recovery mode by holding Volume Up + Power buttons simultaneously.
  • Your device will boot into TWRP.

4.3 Wipe the Current System

To avoid conflicts, you need to wipe the existing Android system before flashing a custom ROM.

  • In TWRP, go to Wipe > Advanced Wipe.
  • Select Dalvik/ART Cache, System, Data, and Cache.
  • Swipe to confirm.

4.4 Flash the Custom ROM

  1. Go back to the Install option in TWRP.
  2. Navigate to the downloaded custom ROM ZIP file and select it.
  3. Swipe to confirm the flash.
  4. Once completed, reboot your phone by selecting Reboot System.

Your OnePlus Ace 3 Pro will now boot into the newly installed custom ROM. Keep in mind that the first boot might take a few minutes.

Step 5: Flash GApps (Google Apps)

Many custom ROMs do not come with Google apps pre-installed. If you want access to apps like the Play Store, Gmail, etc., you’ll need to flash GApps separately.

  1. Download the correct version of GApps (OpenGApps or MindTheGapps) based on your ROM.
  2. Boot back into TWRP recovery.
  3. Flash the GApps ZIP file using the same method you used for the ROM.
  4. Reboot your device.

Post-Rooting Setup: Customizing Your OnePlus Ace 3 Pro

Once your OnePlus Ace 3 Pro is rooted and running a custom ROM, the customization options are nearly endless. You can now:

  • Install Modules via Magisk: Add functionality or system-wide mods using Magisk modules.
  • Remove Bloatware: Use root access to remove any pre-installed apps you don’t want.
  • Improve Performance: Apply kernel tweaks and adjust CPU governors to optimize battery life and performance.
  • Customize the UI: Many custom ROMs allow deep personalization, including UI themes, gestures, and navigation customizations.

Advantages of Rooting and Installing Custom ROMs

  1. Customization: Unlock the ability to customize your phone beyond the limits of stock Android.
  2. Performance Tweaks: You can apply system tweaks to improve performance or enhance battery life.
  3. Control Over the OS: Rooting allows you to have full control over the Android OS, enabling advanced features like backup solutions (e.g., Titanium Backup), firewall apps, or ad-blocking apps.
  4. Security Patches and Updates: Even if the manufacturer stops releasing updates for your device, you can continue to install custom ROMs that offer up-to-date Android security patches.
  5. Extended Lifespan: Custom ROMs can help keep your device relevant long after the official support period ends.

Conclusion

Rooting and installing a custom ROM on your OnePlus Ace 3 Pro can greatly enhance its functionality and extend its life. Whether you’re looking to remove bloatware, improve performance, or access new features, custom ROMs provide an excellent opportunity for advanced customization.

However, it’s important to follow the instructions carefully and always back up your data. By rooting your device, you’ll gain complete control over the OS, and flashing a custom ROM will let you enjoy a new level of personalization. Enjoy your OnePlus Ace 3 Pro with newfound capabilities and customization possibilities!

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