Smartphone Xiaomi Redmi 9, despite its popularity and reliability, may encounter software glitches over time. Users often notice that the device begins to work slower, freezes or system errors appear that cannot be resolved with a regular reset. In such situations, the only correct solution is to completely reinstall the operating system. This process, known as flashing, allows you to return the gadget to its factory state or even update it to a more recent version MIUI.
The firmware update procedure requires some preparation and care. Wrong actions can lead to data loss or, in the worst case, to turning your smartphone into a “brick”. However, if you follow a clear algorithm and use official tools from the developers, the risk is minimized. In this article we will analyze in detail all the stages: from downloading the necessary files to the final download of the updated system.
It is worth noting that flashing gives access not only to eliminating bugs, but also to changing the firmware region. This is especially true for owners of global versions who want to get features available only in Chinese assemblies, or vice versa. Before starting any manipulations, make sure that you understand the essence of each step and are prepared for possible consequences.
Preparing the device and computer
The first and most important step is preparing the workplace. You will need a computer with an operating system Windows, a working USB cable and, of course, the smartphone itself Redmi 9. The cable must be original or a high-quality analogue, capable of transmitting data, and not just charging the battery. Using cheap cables often leads to a broken connection at a critical moment, which is fatal to the firmware process.
You must enable USB debugging mode on your smartphone. To do this, go to Settings → About phone and quickly click 7 times on the item MIUI version. After the message “You have become a developer” appears, return to the main settings menu, select Advanced → For developers and activate the switch USB debugging. Without this step, the computer will not be able to interact correctly with the phone in recovery mode.
⚠️ Attention: Before starting the procedure, be sure to create a backup copy of all important data (contacts, photos, messages). The flashing process involves completely formatting the internal memory, and it will be impossible to restore deleted files without a backup.
It is also critical to charge the device’s battery to at least 60-70%. The process of writing system files is energy-consuming, and if the phone turns off in the middle of the operation, it will be extremely difficult to recover it. Do not rely on the charge indicator, it is better to keep the device on charge for an extra 30 minutes to guarantee.
☑️ Ready for firmware
Selecting firmware type and sources
There are two main types of firmware for devices Xiaomi: Recovery and Fastboot. Recovery firmware has an extension .zip and is installed directly through the recovery menu of the phone itself. This method is simpler, but it does not allow you to downgrade the Android version or change the device region if the bootloader is locked.
The second option is Fastboot firmware with the extension .tgz. It is installed via a computer using a special utility Mi Flash Tool. This method gives complete control over the device, allows you to clear all memory sections and install any version of the software available for your model. It is the Fastboot method that is considered the most reliable in treating serious software failures.
You should download firmware only from trusted sources. The official website Xiaomi or authoritative specialized portals guarantee the integrity of the files. Using modified assemblies from unknown authors can lead to unstable operation of the phone or the introduction of malicious code. Always check the checksum of the file if this option is provided by the source.
Differences between Global and CN versions
The Global version has pre-installed Google services, Russian language and is adapted to our communication frequencies. The Chinese version (CN) does not have Google services out of the box (they must be installed manually) and may not support some 4G bands used in Europe and the CIS. When flashing, it is important not to confuse these versions so as not to lose connection or functionality.
For the model Redmi 9 it is important to know the exact code name of the device, for example lancelot. Firmware from another model, even from the same series, will absolutely not work and can damage the phone. Always check the code name in the settings or on specialized forums before downloading the archive.
Installing drivers and utilities
For successful communication between a PC and a smartphone in download mode, special drivers are required. Most often, they are installed automatically when the cable is connected, but mode Fastboot often requires manual installation of the package Qualcomm HS-USB QDLoader or drivers Xiaomi USB Driver. Without correctly installed drivers, the Mi Flash app simply will not see the connected device.
The main tool for flashing firmware via a computer is the utility Mi Flash Tool. It must be downloaded and unpacked to the root of drive C or any other folder, the path to which does not contain Cyrillic characters and spaces. The presence of Russian letters in the path to files often causes errors when writing data to the phone.
| Component | Purpose | Where to find |
|---|---|---|
| ADB Drivers | Communication in debug mode | SDK Platform Tools |
| Fastboot Drivers | Communication in mode bootloader | Xiaomi / Mi Flash website |
| Mi Flash Tool | app for firmware | Official MIUI forum |
| USB Cable | Physical connection | Phone equipment |
After installing all components, it is recommended to restart the computer. This ensures that all system services that handle USB ports are up to date and ready to handle the new hardware. You can check the installation of drivers in Device Manager Windows by connecting the phone in Fastboot mode.
If the computer does not see the phone in Fastboot mode, try connecting the cable to another USB port, preferably directly into the motherboard (at the back of the system unit), bypassing the front panels or USB hubs.
Entering Fastboot mode and flashing
To switch Redmi 9 to flashing mode, turn off the smartphone completely. Then hold down the Power and Volume Down buttons at the same time. Hold them until an image of a hare repairing a robot appears on the screen with the caption Fastboot. This means that the phone is ready to receive commands from outside.
Connect the phone to the computer with a cable. Run the utility Mi Flash Tool as administrator. Click the button Refreshfor the app to detect the connected device. Your phone's serial number should appear in the list. If an error is displayed instead of a number or the field is empty, it means that the drivers are installed incorrectly.
Click the button Select and specify the path to the unpacked folder with the firmware. It is important to select the folder containing the image files, and not the archive itself. After selecting the path, pay attention to the bottom part of the app window, where there are three options:
- 🧹 clean all — complete data clearing and installation of a clean system (recommended).
- 💾 save user data — installation of the system while saving user files (not recommended in case of failures).
- 🔒 clean all and lock — complete clearing and re-locking the bootloader (use only with the official firmware!).
Having selected the mode clean all, press the button Flash. The recording process will begin and will take between 200 and 500 seconds. During this time, it is strictly forbidden to disconnect the cable or close the app. The progress bar will show the status of the operation, and progress messages will appear in the app log.
Possible errors and their solutions
Various errors may occur during the firmware process, the most common of which is Missmatching image and device. It means that you are trying to install firmware that is not intended for this model or region. There is only one solution: download the correct firmware file corresponding to the device code name.
Another common problem is an error Anti-rollback check failed. This triggers Android downgrade protection. If you try to roll back to an older version of the system than the one you have now, the bootloader will block the process. In this case, you need to look for firmware with the same or higher security index.
⚠️ Attention: Error
Can't flash to deviceoften occurs if the bootloader is locked on the phone, and you are trying to flash an unofficial version or use the modeclean all and lockwith global firmware on a Chinese device. Unlocking the bootloader requires a separate procedure through the MIUI website.
If the process is stuck at a certain percentage and does not move for more than 10 minutes, there is most likely a communication failure. Don't panic. Try carefully reconnecting the cable without turning off the phone. In some cases, restarting the service ADB on the computer or replacing the USB port helps.
Most errors during firmware are not related to a broken phone, but to an incorrectly selected firmware file or a bad USB cable. Carefully checking these two points solves 90% of problems.
Initial setup after update
After the process is successfully completed, the phone will automatically reboot. The first launch may take significantly longer than usual - from 5 to 15 minutes. A logo MIUI or a loading animation may be displayed on the screen. Do not try to reboot the device at this moment, the system is carrying out initial optimization of applications and setting up partitions.
When the phone finally boots up, you will see the welcome screen. You have to go through the standard setup procedure: select a language, connect to a Wi-Fi network and log in. Google account. Since the memory has been completely cleared, all applications will have to be reinstalled from the store Play Market.
It is recommended to check for new system updates immediately after downloading. Go to Settings → About phone and click on the MIUI version icon. Sometimes, immediately after a global update, small patches are released that fix critical vulnerabilities. It is also worth checking the operation of the main modules: camera, sound and sensor.
Why does the phone get hot after flashing the firmware?
In the first hours of active operation after flashing, the system performs background file indexing and database optimization. This causes increased load on the processor and, as a result, heating of the case. This is a normal phenomenon that will go away on its own after 1-2 days of use.
Frequently asked questions (FAQ)
Will all information from the phone be erased when flashing the firmware?
Yes, when using the Fastboot method with the parameter clean all the internal memory will be completely formatted. All photos, contacts and applications will be deleted. When flashing firmware via Recovery, it is sometimes possible to save data, but this does not guarantee the safety of files in case of failures.
Is it possible to flash Redmi 9 to a newer version of Android than the official one?
Officially, you can only update to the version that Xiaomi provides for your model. Installing newer versions of Android is only possible through custom firmware (for example, LineageOS), which requires unlocking the bootloader and voids the warranty.
What to do if the phone is stuck at the logo after flashing the firmware?
Try to force a reboot by holding the power button for 15-20 seconds. If this does not help, the firmware may not have installed correctly, and the procedure must be repeated by selecting the mode clean all in the Mi Flash Tool.
Do you need to unlock the bootloader to install the official firmware?
No, to install the official global or Chinese firmware through the Mi Flash Tool, unlocking the bootloader is not possible required if you do not change the device region (for example, from China to Global). However, to change the region, unlocking is required.
Is it safe to flash the phone yourself?
If you strictly follow the instructions and use the original software, the risk is minimal. The main danger lies in the human factor: disconnecting the cable, selecting the wrong file or interrupting the power supply. If you are not confident in your abilities, it is better to contact a service center.