Xiaomi Redmi 9, released in 2020, remains a popular device due to its reliability and availability. However, over time, standard software no longer meets the needs of the user, new security features or bug fixes that need to be implemented. Updating the firmware is not just a change of numbers in the settings, but a complex process that affects the core of the system, hardware drivers and the MIUI shell interface.
Many owners are afraid to start this process because of the risk of losing data or turning the device into a brick. These fears are often exaggerated if you follow the algorithm. In this article, we will examine all available methods of updating the software, from automatic notifications to manual installation through the computer, which will allow you to choose the most suitable option for your situation.
Before taking action, you need to understand why you need to intervene at all. Often users ignore notifications, which leads to a build-up of security vulnerabilities. The firmware contains critical patches that close privacy holes. In addition, new versions of the shell often optimize battery life, which for the Redmi 9 with its capacious battery is an important factor in longevity.
Device preparation and data backup
The beginning of any interference with system files requires careful preparation. The first step should always be to back up. Even if you plan to upgrade without losing data, human error or sudden power failure can lead to unpredictable consequences. Use built-in MIUI tools or Google cloud services to save contacts, photos and messages.
Pay attention to the battery charge. The flashing process is energy intensive, and if the device turns off at the time of writing system partitions, recovery may take hours or require paid repairs. Charge the smartphone to a level of at least 60-70% to have enough power.
⚠️ Warning: Do not neglect to check the free space. to install a major update to the system may require up to 5-8 GB of free internal memory, even if the file itself weighs less. Free up space in advance by deleting the cache of heavy applications.
It is also worth checking the integrity. USB-If you plan to use a computer, cheap charging-only cables won't transmit data, which will cause connection errors. Use the original wire or high-quality analogue with data transmission.
☑️ Checklist before firmware
Automatic update via the settings menu (OTA)
The easiest and safest way to get a new version of software is to use the built-in OTA (Over-The-Air) mechanism, which checks the servers for new builds and suggests installing them, a method ideal for those who do not want to understand the technical details and prefer to minimize risks.
To start the process, go to Settings → About Phone and click on the MIUI version logo. If the update is available, a button will appear. It is important to understand that updates come in waves, and your Redmi 9 notification may come later than on a friend's device with the same model.
In some cases, the system may write that there are no updates even though they have already been released, this may be due to the firmware region or the current version of the software. If you are using the global version but are in a region where it is not yet certified, OTA may not come.
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Use a stable Wi-Fi connection to download OTA-Updates are made as files can weigh more than 2GB and mobile traffic can be consumed quickly.
Manual installation via Recovery (file selection method)
If the automatic search does not yield results, you can use the manual installation method. You will need to download the firmware file in.zip format from the official website or verified resources. The file must be placed in the root of internal memory or on a memory card (if the model supports).
After downloading the file, go to the update menu again (Settings) → About the phone) and click three dots in the corner of the screen. Select "Select firmware file." The system will check the integrity of the archive and, if the version is newer than the current one, prompt you to start installing. OTA.
But there’s an important caveat: you can’t roll back on older firmware with this method, and you can’t change the firmware region (for example, put global over Chinese) without completely cleaning up the data, otherwise the phone will go into a cyclical reboot.
⚠️ Note: The firmware file must be in.zip format and must NOT be unpacked. If you unpack the archive, the system will not be able to read its structure and will give an error.
Comparison of MIUI versions and compatibility with Redmi 9
Redmi 9 originally came to Android 10 with MIUI 11, but received updates to Android 11 and the corresponding versions of MIUI 12/12.5. Understanding the differences between stable and beta versions is critical for comfortable use.
Below is a table to help you understand the main types of builds available for this model:
| Type of firmware | Stability | Frequency of updates | Who's it meant for? |
|---|---|---|---|
| Stable (Stable) | Tall. | Every 1-2 months | For ordinary users |
| Beta (weekly) | Medium | Weekly (Friday) | For testers and enthusiasts |
| Recovery | Depends on the base. | On the way out. | For manual installation without PC |
| Fastboot | Depends on the base. | On the way out. | For computer firmware |
The Global version (Global) contains all of Google’s languages and services, making it the preferred version for most users outside of China.The Chinese version (CN) may not have some communication frequencies and services pre-installed, requiring additional customization.
When choosing a file to install manually, always check the code name of the device. For Redmi 9, it is usually lancelot (Global) or lancelot (China). Installing firmware from Redmi 9C or 9A on Redmi 9 is strictly prohibited and will lead to breakage.
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Always check the device’s code name before downloading the firmware, as the Redmi 9 series models have different code names.
Fastboot and Mi Flash Tool
This method is considered "heavy artillery" and is used when the phone is not turning on, stuck on the logo or requires a complete cleanup of the system. ADB/Fastboot The firmware file is required in.tgz format, which must be pre-unpacked.
Put your smartphone into Fastboot mode by slamming the volume button and connecting the cable to your PC. A hare in an eardress cap repairing an android appears on the screen. In the PC program, press Refresh, select the device and path to the unpacked firmware folder.
fastboot devicesThis command in the console lets you check if your computer sees your device in bootloader mode. If the answer is blank, check the drivers or cable. In the Mi Flash interface, it is important to choose the correct firmware mode at the bottom: clean all or save user data. To navigate between regions or Android versions, choose only clean all.
⚠️ Note: When using Clear All mode, all your data will be permanently deleted. Make sure that the backup is made and checked before the process begins.
It takes 5 to 15 minutes. Don't touch the cable or turn off the computer. Once completed, the phone will automatically restart. The first run can take up to 10 minutes -- that's OK, the system optimizes applications.
Solutions and recovery after failure
Even if you follow all the rules, you can get errors, and a common problem is "File is corrupted" or "File failed" -- often indicating that you're trying to install an older version on top of the new version or that the file is not fully downloaded.
If the phone is gone into an endless bootloop, try recovery mode. Select language (if available), then Wipe Data → Wipe All Data. This will reset to factory settings and often resolve software conflicts.
What is Anti-Rollback Protection?
In cases where standard methods do not help, it may be necessary to use specialized tools to restore the boot partitions, but this already requires deep knowledge and possibly disassembly of the case to close the test points.