On this page, we provide a step-by-step guide on how to install the unofficial Android 14 Custom ROM on the Xiaomi Mi 9, codenamed “cepheus.” If you want to...
Mohammed Huwais
Last updated on February 16, 2026
Mohammed Huwais
Author
I started my career as a blogger in 2014 and also worked on an Android niche platform to gain extra income. I cover the topic on How to guides, software updates, Custom ROM updates and also product review. I'm 24 years old, completed MBA (Master of Business Administration) from Sikkim Manipal University.
On this page, we provide a step-by-step guide on how to install the unofficial Android 14 Custom ROM on the Xiaomi Mi 9, codenamed “cepheus.” If you want to install the pure version of Android 14, you’re in the right place.
Xiaomi Mi 9 is an Android smartphone announced in February 2019. It Features a 6.39″ display with a Snapdragon 855 chipset, a 3300 mAh battery, 256 GB storage, and 8 GB RAM.
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Xiaomi Mi 9 is powered by a Qualcomm Snapdragon 855 chipset coupled with 6/8GB of RAM and 64/128GB of internal storage. The device came out of the box with Android 9.0 Pie under MIUI 10 and backed by a 3300 mAh battery (Non-removable). As far as the camera concerned, the device has a Triple-camera setup with 48MP + 12MP + 16MP primary sensors and a selfie camera with an 20MP lens. Other connectivity option includes 4G-VoLTE, GPS, Glonass, Bluetooth, Mobile Hotspot, accelerometer, ambient light sensor, gyroscope, proximity sensor, and compass/ magnetometer. etc. The Xiaomi Mi 9 come with a fingerprint sensor under display.
Android 14, Google’s fourteenth major iteration and the 21st version of its renowned operating system, was unveiled to the public on October 4. The pioneering devices graced with this fresh release were the Pixel 8 and Pixel 8 Pro, underscoring Google’s commitment to keeping its flagship devices at the technological forefront.
This latest installment boasts a plethora of enhancements and innovative features. Among the standout additions are a revamped lock screen, a more intuitive system share sheet, and a redesigned battery-saving mode. Users can also delight in the convenience of drag-and-drop capabilities during app switches, a groundbreaking Ultra HDR support for media, and the visually striking Material You-themed settings toggles. With AI-generated wallpapers and a new monochromatic theme, Android 14 not only refines functionality but also offers a refreshed aesthetic experience.
Whats working? Wi-Fi RIL Volte Mobile data GPS Camera Flashlight Camcorder Bluetooth Fingerprint FM radio Sound vibration Known issues ? You Tell Us
As the title indicates, this article provides the necessary steps and requirements to install the AOSP Android 14 build on the Xiaomi Mi 9 (cepheus) model.
Before diving into the guide, please ensure you’ve met all the prerequisites listed below.
Before we begin this procedure, I strongly recommend you create a backup of your device storage and all your files stored on your device. Moreover, following the steps mentioned in this post carefully is advised to avoid permanent damage or bricking your device.
It’s highly recommended to charge your handset before unlocking the bootloader to avoid your device from shutting down occasionally while going through the process. Keep at least 50% of the charge or higher for a smooth operation.
You can skip this adb and fastboot part if you have already installed TWRP Recovery on your Xiaomi Mi 9.
Using the ADB and Fastboot commands (platform-tools), you can boot your Android device into the bootloader mode (download mode), making it easy for you to proceed with further steps. ADB (Android Debug Bridge) creates a connection or bridge between the device and the computer to sideload files.
Fastboot is a more advanced command utility tool for Android devices that works with computers. You can download ADB and Fastboot Binaries (Platform-Tools).
To create a strong and successful connection between a mobile device and a computer using a USB data cable, you will need a USB Driver. It is essentially a set of files that enables you to transfer files between the connected devices, flash files on the handset, and much more.
It is important to note that USB drivers can be utilized and operated by mobile devices and other external devices on a Windows computer. These include but are not limited to mice, keyboards, printers, external hard drives, speakers, and USB flash drives. If you need to download Xiaomi USB drivers, you can find them here.
You need to unlock the Xiaomi Mi 9’s bootloader before installing custom ROMs.
You must install TWRP Recovery on your phone to install any custom ROM on your device. After unlocking the bootloader, follow our guide to install TWRP Recovery on your Xiaomi Mi 9.
You will find all the Android 14 custom ROMs for your Xiaomi Mi 9 (cepheus) here.
| crDroid v10.0 | XDA Development Page |
| PixelOS | XDA Development Page |
| Evolution X | XDA Development Page |
Most third-party AOSP ROMs, also known as aftermarket firmware, do not include preinstalled Google apps. You can manually install Android 14 GApps with our guide.
Warning!
GetDroidTips won’t be responsible for any issue that may happen to your device if you flash it on another device and brick it. Do it at your own risk.
adb reboot recovery
TWRP Home
The installation of AOSP Android 14 on Xiaomi Mi 9 is complete, and your device will now boot with the newly installed OS. It’s worth noting that the first boot may take some time, and you may need to set up your device from scratch. With that, our guide to installing AOSP Android 14 on Xiaomi Mi 9 comes to an end.
If you want to try out the latest Android OS version on your Xiaomi Mi 9, flashing the ported Android 14 is an option. Although it seems like the Xiaomi Mi 9 won’t receive the official Android 14 update from the manufacturer, you can still enjoy most of the features and visual treatment with this ported version. However, if you encounter any bugs or stability issues, it’s important to report them to the respective forum.
That’s it, guys. We assume this guide was helpful to you. For further queries, you can comment below.
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