Download and Install Android 15 on OnePlus 12R / Ace 3

In this guide, we'll walk you through the process of installing the unofficial Android 15 Custom ROM on the OnePlus 12R / Ace 3. If you're eager to experience...

Abd Razaaq

Last updated on August 9, 2025

Abd Razaaq

Author

I'm a Tech Content Writer and Full-Time blogger. Since I love Android and Google's device, I started my career in writing for Android OS and their features. This led me to start "GetDroidTips". I have completed Master of Business Administration at Mangalore University, Karnataka.

OnePlus 12R Overview

The OnePlus 12R / Ace 3 comes with a range of impressive specifications tailored for users seeking a powerful yet slightly more accessible alternative within the OnePlus lineup. Here’s a summary of its key features:

Operating System: Android 14-based OxygenOS 14, ensuring a smooth and user-friendly interface with the latest Android features.

Display: A 6.78-inch 1.5K (1,264×2,780 pixels) LTPO 4.0 AMOLED screen. This display offers high resolution and adaptive refresh rate capabilities for efficient power usage and fluid visual experience.

Processor: Powered by the Snapdragon 8 Gen 2 chipset, which is known for its high performance and efficiency. This is the same chip used in the previous OnePlus flagship, ensuring top-tier performance.

RAM: Up to 16GB of LPDDR5x RAM, providing ample memory for multitasking and demanding applications.

Camera Setup:

Rear Cameras: A triple-camera setup including a 50-megapixel primary sensor with a Sony IMX890 sensor and an f/1.8 aperture, an 8-megapixel ultra-wide-angle camera with a 112-degree field of view, and a 2-megapixel macro camera with an f/2.4 aperture.
Front Camera: A 16-megapixel selfie camera with an f/2.4 aperture, designed for clear and detailed self-portraits.

Storage: Options include 128GB of UFS 3.1 storage or 256GB of UFS 4.0 storage, offering fast read/write speeds for quicker app loading and file transfers.

Connectivity: While it supports the same connectivity options as its flagship counterpart, the OnePlus 12R / Ace 3 uniquely offers Bluetooth 5.3 for enhanced wireless connectivity.

Battery: A 5,000mAh battery supporting 100W SuperVOOC wired charging, promising rapid charging times. However, it lacks wireless charging capabilities.

Physical Dimensions: The phone measures 163.3×75.3×8.8mm and weighs 207g, making it a sizable yet manageable device in hand.

Android 15 and Its Features

Google has officially rolled out Android 15, packed with a wide array of new features and significant improvements. This latest version promises enhanced productivity, stronger privacy protections, and smoother overall performance. Released on September 3, Google has made the source code available through the Android Open Source Project (AOSP). While Pixel devices are the first to receive the Android 15 update, it will soon be available on select devices from brands like Honor, iQOO, Lenovo, Motorola, Nothing, OnePlus, Oppo, Realme, Samsung, Sharp, Sony, Tecno, Vivo, and Xiaomi in the upcoming months.

Android 15 introduces several innovative features, including Private Space—which allows users to keep sensitive apps separate from the rest of the phone—and Improved Audio Image Descriptions. Additionally, there are new satellite connectivity options, an Earthquake Alert System, offline maps for Wear OS, and enhanced Bluetooth capabilities. Other key updates include Partial Screen Recording, Malicious App Blocking, App Archiving, Audio Sharing, improved low-light camera performance, better battery life, enhanced theft protection, a more user-friendly taskbar, and robust fraud and scam protection. Android 15 aims to deliver a more secure, versatile, and responsive user experience.

Charge Your Phone

Ensure your device has at least 50% or more battery before unlocking the bootloader or flashing the ROM to prevent any unexpected shutdowns during the process.

Download ADB and Fastboot Binaries

You can skip this part if you have already installed TWRP Recovery on your OnePlus 12R / Ace 3. For those who haven’t, ADB and Fastboot commands (platform-tools) are required to boot your device into bootloader mode, allowing you to perform the necessary flashing operations. ADB (Android Debug Bridge) establishes a connection between your device and computer, while Fastboot is a more advanced command-line utility for flashing and modifying Android devices.

You can download the ADB and Fastboot Binaries (Platform-Tools) here.

Download Xiaomi USB Drivers

You’ll need the appropriate USB drivers to ensure a successful connection between your OnePlus 12R / Ace 3 and your computer. These drivers enable file transfers, flashing, and other operations between your devices.

You can download the official OnePlus USB drivers here.

Unlock the Bootloader of Your Phone:

Unlocking the bootloader of your OnePlus 12R / Ace 3 is essential before you can install any custom ROM. Make sure to follow Xiaomi’s official instructions for unlocking the bootloader. Unlocking the bootloader will wipe your device, so back up your data beforehand.

Install Orange Fox Recovery:

To install OrangeFox Recovery on your device, you can download it from the official OrangeFox website:

OrangeFox Recovery Download Link: OrangeFox Recovery

If you encounter any issues with OrangeFox Recovery, you can revert to the Stock Recovery. Here’s how to do that:

Download Stock Recovery:
- You can download the stock recovery image from your ROM package. Simply extract the recovery.img from the ROM .zip file.
GitHub Release:
- Optionally, you may also find stock recovery images from repositories like GitHub. Use the same link to download the stock recovery for your specific device model if available.

By following these steps, you can switch between OrangeFox Recovery and Stock Recovery depending on your preference or issue resolution.

You can also try to install TWRP Recovery on your OnePlus 12R / Ace 3. TWRP is necessary for flashing custom ROMs, kernels, and other modifications. Follow this guide to install TWRP on your device.

Download Android 15 ROM:

You can download the Android 15 custom ROMs for the OnePlus 12R / Ace 3 from the links below:

PixelOS

XDA Development Page

Download Android 15 Gapps:

Currently, there are no specific GApps packages officially released for Android 15. However, based on community feedback, NikGApps for Android 14 seems to be a reliable alternative. You can try using the NikGApps Core package from the Android 14 version to flash onto your Android 15 custom ROM.

You can download the NikGApps Core for Android 14 from the following link: Download NikGApps Core for Android 14

This package should provide the basic Google services, including the Play Store, on your Android 15 device. Since this is a workaround, there may be some compatibility issues, but it’s worth trying until an official Android 15-compatible GApps package is available.

Make sure to flash it right after the ROM installation during the TWRP installation process, and don’t forget to check for updates to GApps periodically.

Warning!

GetDroidTips is not responsible for any issues that may happen to your device if you flash it on another device and brick it. Do it at your own risk.

Instructions To Install:

Connect your device to the PC via a USB cable. Make sure USB Debugging is enabled.
Then, go to the platform-tools folder, type CMD in the address bar, and hit Enter. This will launch the Command Prompt.
Execute the below command in the CMD window or enter recovery mode using the Volume and Power button combination to boot your device to TWRP Recovery:
```
adb reboot recovery
```
Now head to the Install section and navigate to the downloaded vendor and firmware. Perform a right swipe to flash it.TWRP Home
If you want Google Apps as well, you need to flash it at this instance. Go to Install, select the GApps ZIP file, and perform a right swipe to flash this file.
When that is done, you may reboot your device. Head over to Reboot and select System.

The first boot after installing a custom ROM may take a bit longer than usual, so don’t panic if it seems slow. After the device boots, you will need to set it up as a new device, just like when you first got it.

Conclusion

If you’re eager to try the latest Android 15 OS on your OnePlus 12R / Ace 3, flashing this custom AOSP build is the way to go. While it is unlikely that the OnePlus 12R / Ace 3 will receive an official Android 15 update from Xiaomi, this custom ROM will give you access to most of Android 15’s features and updates. However, as with any custom ROM, you might encounter some bugs or stability issues, so it’s a good idea to report them to the relevant XDA forum.

That’s all for this guide. We hope it helped you successfully install Android 15 on your OnePlus 12R / Ace 3. If you have any questions or run into any issues, feel free to leave a comment below. Good luck!

Download and Install Android 15 on OnePlus 12R / Ace 3

OnePlus 12R Overview

Android 15 and Its Features

What’s Working and Known Bugs:

Steps To Install AOSP Android 15 on OnePlus 12R / Ace 3

Pre-Requisites