Owners of the popular budget smartphone Xiaomi Redmi 9 often face the need to update the operating system to access new interface features and security improvements. Android 11 brings significant changes to the management of notifications, privacy and the appearance of the MIUI shell. However, the process of transitioning to a new version may not be obvious to the unprepared user, especially if automatic air updates do not come or the device was purchased with Chinese firmware.
Before you start taking action, you need to clearly understand what method is suitable for your case. There are several ways: official updating through the settings menu, manual installation of the Recovery archive, or a more complex method of firmware through Fastboot with complete data cleaning. Installing global firmware on top of the Chinese version requires you to unlock the bootloader, which is a critical condition. Incorrect choice of method can lead to loss of personal data or, in the worst case, to a software failure of the device.
In this article, we will take a look at all the steps of preparing and installing Android 11 directly on your gadget. We will look at the necessary tools, ways to avoid typical errors and nuances that are not covered by official instructions. Careful follow the steps will allow you to safely upgrade your Redmi 9, turning it into a more modern and functional device.
Preparation of the smartphone and data backup
Any process involving flashing or major system upgrades should start with creating a full copy of important data. Even if you plan to simply update your phone through a menu, there is always a risk of accidental failure or file system error. Backup is the only way to ensure that your photos, contacts and instant messengers are safe.
For Xiaomi owners, the most convenient way is to use the built-in Mi Cloud service or sync with a Google account. You can transfer contacts, calendar and notes to the company's servers, so that after the update you simply log in and return them to place. For photos and videos, you better use Google Photos or manually copy DCIM and Pictures folders to your computer or external drive.
⚠️ Note: The installation process of a new version of Android is often accompanied by a complete cleanup of the device’s internal memory, especially when changing the firmware region or using the Fastboot method.
It is also critical to check the battery level.The process of writing system files is energy intensive, and a sudden power outage at this point can lead to serious consequences. Charge the device to at least 60-70%, or better leave it connected to the original charger during the entire procedure.
☑️ Checklist before firmware
Don’t forget to know the exact model of your device too. Redmi 9 has several modifications with codenames lancelot (Global), merlin (China/India) and others. Installing firmware designed for another model is strictly prohibited, as this will lead to driver incompatibility and the inability to turn on the phone.
Checking the availability of official updates by OTA
The easiest and safest way to get Android 11 is to wait or force an update through the built-in OTA (Over-The-Air) mechanism. Xiaomi distributes updates in waves, so on one device the new version can appear earlier than on another, even if they are purchased from the same store.
To check for a new version, go to the phone's settings menu. Find the About Phone section and click on the major MIUI version icon. The system will contact the update server and check the updates installed. If the server "sees" your device and confirms compatibility, you will be prompted to download and install the update package.
Sometimes there is an update, but it doesn't come automatically due to cache or temporary network errors, so you can try clicking on the three dots in the top right corner of the screen and select "Select a firmware file." However, this method only works for updates within one region (for example, from MIUI 12 to MIUI 12.5 inside the Global version) and will not allow you to go from the Chinese version to the global version without unlocking.
If the menu says "No Updates found," it doesn't mean that there aren't any, it could mean that your current version is too old to jump straight, or that your firmware region is not a priority for the new version's rollout, and you have to use manual installation methods, which we'll discuss later.
Unlocking the bootloader: the need and the process
For users who want to install MIUI 12.5 global firmware based on Android 11 on the Chinese version of Redmi 9, or those who do not receive an update, they will have to face the procedure of unlocking the bootloader.
The unlocking process requires a Mi Account to be linked to the device. You need to go to Settings → For Developers → Mi Unlock Status and link the account to the device. After that, the system will ask you to wait a certain time — usually 168 hours (7 days), although sometimes the period can be reduced to 36 hours or increased to 30 days depending on the security policy.
⚠️ Warning: Unlocking the bootloader results in a complete deletion of all data from the device (Factory Reset), which can also cancel the warranty in some service centers and reduces the overall security of data on the phone.
After the waiting time has expired, you will need a Windows computer and the Mi Unlock Tool utility. The phone switches to Fastboot mode and connects to the PC. The program will check the account status and, if all conditions are met, allow unlocking. This step is the point of no return for the standard software guarantee.
It is important to understand that when you unlock the phone, you will be alerted that the device is unlocked, which is normal for custom use cases, but can be confusing for ordinary users, and some banking applications may require additional manipulation (such as hiding root rights or using Magisk Hide) to work properly.
Manual installation of firmware through the Recovery menu
If the bootloader is unlocked or you are updating within the same region, but OTA does not work, you can use the Recovery update method. To do this, you will need to download the.zip firmware archive from the official Xiaomi website or trusted resources. Make sure that you download the Recovery version, not Fastboot (which has the.tgz extension).
The downloaded file must be renamed update.zip and placed in the root of the phone’s internal memory (not in the folder, but in the main directory), then go to Recovery mode: press the volume button and the power button simultaneously before the Mi logo appears.
In the Recovery menu (which is controlled by volume buttons and confirmed by the power button), select a language (usually available in English and Chinese) and press the Install Update or Update button. The system will find the update.zip file and begin the installation process.
What if Recovery says "Can't verify update"?
Once the installation is complete, the phone will suggest a reboot. The first launch may take more than usual time - from 5 to 10 minutes, as the system optimizes applications. Don't panic if the screen is lit for a long time with the Mi or Android logo, this is a regular situation for the first start after a major update.
Firmware of the device via Fastboot on the computer
The most radical and effective method is firmware via Fastboot mode.This method allows you to completely replace the phone's software, fixing file system errors and ensuring a clean installation of Android 11, USB-High quality cable and Mi Flash Tool.
Download the Fastboot firmware archive and unpack it on your computer. It is important that the path to the folder is Cyrillic-free and short enough, such as a short one, C:\xiaomi\lancelot\. There must be a file inside the folder. flash_all.bat or similar script, but it is more convenient to use the graphical interface Mi Flash.
Put your phone in Fastboot mode (clambing the volume button when connecting to a PC). In Windows Device Manager, the Android Bootloader Interface should appear in the Android Devices section. If there is an unknown device, you need to install drivers. ADB/Fastboot qualcomm.
| Parameter | Recovery (.zip) | Fastboot (.tgz) |
|---|---|---|
| PC requirement | Not required | Definitely (Windows) |
| Data retention | Possibly (on update) | Complete removal (Clean All) |
| Change of region | Only with an unlocked BL | Only with an unlocked BL |
| Speed. | Slower. | Hurry up. |
In the Mi Flash Tool, click "Refresh" to see your phone. Select firmware mode: clean all (complete cleaning, recommended) or save user data (trying to save data, can cause errors when changing region). Press "Flash" and wait for the process to end, which will take from 200 to 500 seconds.
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Use the original. USB-cable and connect it directly to the port on the computer motherboard (back of the system unit), avoiding USB-hubs and front panels of the body to avoid communication breakage when firmware.
Solving common mistakes and problems
When installing Android 11 on Redmi 9, users may encounter various difficulties. One common error is the message "Zip file signature verification failed" when installed via Recovery. This means that the file integrity is broken when downloaded or the file is intended for another model. The solution is one: download the firmware from another source or check the hash amount of the file.
Another problem is a "boot" (cyclical reboot), when the phone is constantly hanging on the logo. If this happened after a failed update, you will most likely have to reset through Recovery (Wipe Data) or refashion through Fastboot with a complete cleanup. In rare cases, waiting helps: sometimes the system just recovers data for a long time after a failure.
⚠️ Warning: If the phone stopped responding to buttons and didn’t turn on (black screen), it may have entered mode EDL (Emergency Download Mode – This mode is often only available in an authorized Xiaomi service center using paid accounts.
Users also complain about the battery drain immediately after the upgrade, which is normal in the first 2-3 days, while the system is busy indexing files and optimizing background processes in the new version of Android.
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Most of the errors in the firmware are due to unstable USB-Connecting, using a non-original cable or interrupting the process by the user. Patience and reliable equipment are the key to success.