Owners of the popular Xiaomi Redmi Note 9 smartphone often wonder how to access the latest interface features and security improvements. Upgrading to MIUI 12 dramatically changes the visual style of the device, adds animation "superbugs" and redesigns the notification control center. For many users, switching to this version of the shell becomes a critical step to improve the performance of the gadget.
The process of installing a new firmware may seem difficult for beginners, but with strict adherence to the algorithm of actions, it takes no more than fifteen minutes. It is important to understand that there are several ways to transition: through the standard Update menu and the method of manual installation of the archive. The choice of a particular path depends on whether you have access to the official newsletter. OTA (Over-the-Air or you will have to work manually.
Before you start taking action, you need to make sure that your particular model is compatible. The global version of Redmi Note 9 (codename merlin) and the Chinese version (codename curtana) have different firmware packages. The wrong file selection can lead to software failure, so read the specifications carefully before you start downloading.
Preparation of the device for firmware
The initial stage is the foundation of a successful operation. Any intervention in the system partition requires a stable power source and free storage space, make sure that the battery is at least 60%, and it is better to connect the device to the charger throughout the process.
Backing up data is a must-do step that is often ignored and regretted. Although an airburst usually saves files, manual installation may require clearing the cache or even a full reset. Use the built-in Mi Cloud app or connect your smartphone to your computer to copy important photos and contacts.
- 📱 Check the space: minimum 5GB of free memory is required.
- 🔋 Charge the battery to above 60% to avoid shutdown.
- ☁️ Make backup contacts and photos in the cloud or on PC.
⚠️ Note: If your smartphone was previously unlocked to obtain root rights or install custom recavers, the standard OTA-The update may not be installed or result in a cyclic bootloop, which requires a full Fastboot flashing.
It’s also worth checking out the current version of Android. MIUI 12 is based on Android 10 for this model. If you have a very old version of MIUI 11 running Android 9, the system may need an interim update before upgrading to the twelfth version.
The official method is through OTA (Over-The-Air)
The easiest and safest way to get a new shell is to wait for push notifications from Xiaomi servers.The system itself checks the region, model and compatibility, suggesting that the package is downloaded only when it is fully ready for your device, which minimizes the risk of errors.
To check for updates, go to Settings → About Phone → MIUI version. Click on the system logo or the “Check Updates” button. If the server has given a command, the archive will start downloading. The speed depends on your Internet connection, so it is recommended to use Wi-Fi.
Sometimes, it happens that neighboring phones have received an update and yours has not. This is normal practice of phased deployment, in which case you can try changing the region in the settings → Settings → Additional settings → Region to the country where the release occurred earlier (for example, Indonesia or India), check the updates, and then return your region.
💡
Use a stable Wi-Fi connection to download OTA-package, as the firmware size can exceed 2.5 GB, which will significantly affect mobile traffic.
Once booted, the system will suggest rebooting. The screen will go out, the MI logo and progress indicator will appear. Don't touch the device at this point. The process can take anywhere from 5 to 10 minutes.
Manual Update (Local Update)
If you don't get an automatic update for months, you can use the manual installation method. ZIP-The firmware archive for Redmi Note 9 from a trusted resource, such as miui.com or xiaomirom.com. Make sure you download the Recovery version, not Fastboot.
Once you download the file, place it in the root folder of your smartphone's internal memory. Then open the System Update app, click three dots in the upper right corner, and select Select File. Find the downloaded archive and confirm the installation.
The system will check the integrity of the file. If that's correct, the installation process will begin. OTA-update stuck at a certain percentage or gives a check error.
☑️ Checklist before manual installation
Therefore, backing up data before manual installation is a must that cannot be neglected.
Installation via Fastboot and Mi Flash
For advanced users, or when the phone is brick-and-brick or doesn't see an update, Fastboot mode is used. This method requires a Windows computer and a Mi Flash Tool installed. It allows you to install the system cleanly, which often solves problems with bugs and brakes.
First, you need to unlock the bootloader through Mi Unlock, a procedure that can take 3 to 7 days to wait after you have attached your account. Without the unlocked bootloader, you can't install Fastboot firmware.
The algorithm of actions is as follows:
- Download the Fastboot ROM archive (extension.tgz) and unpack it on your PC.
- Run the Mi Flash Tool on behalf of the administrator.
- Turn off your phone and enter Fastboot mode (clamping Volume Down + Power).
- Connect the cable to your PC and press Refresh in the program.
- Select the path to the unpacked folder and click “Flash”.
| Parameter | Recovery ROM | Fastboot ROM |
|---|---|---|
| File extension | .zip | .tgz |
| I need a PC. | No. | Yes (required) |
| Unlocking BL | Not required | Required. |
| Data retention | Yeah (usually) | No (full clean-up) |