Owners of the popular Redmi Note 9 often wonder how to access the latest operating system features and improve device security. Updating the firmware is not just about changing the numbers in the version of the software, but getting critical security patches and optimizations for the Snapdragon 665 processor. Xiaomi regularly releases MIUI packages that can dramatically change the interface and speed of the smartphone.
Software upgrades can vary depending on the region where the device was purchased and the current installed version. The Global version receives updates on its own schedule, different from the Chinese or Indian build. It is important to understand that the transition between different types of firmware requires complete data cleaning, so pre-preparation.
In this article, we will take a look at all the available methods for installing the new system, from a standard air update to manual flashing through Recovery. You will learn how to bypass possible download errors and where to look for official files. Installing firmware of another regionality without unlocking the bootloader is impossible and can lead to locking the device.
Preparation of the device for installation of a new version of the software
Before you start any manipulation of system files, you need to make sure that the smartphone is fully ready for the procedure. Battery charge should be at least 60%, since the process of recording data is energy intensive and interrupting at low charge is critical. It is also recommended to free up space in internal memory by deleting unnecessary videos or transferring photos to a computer or cloud storage.
Make sure to back up important contacts, messages and app settings. While a regular Settings update usually saves user data, there is always a risk of software failure. Use the built-in Security app or Google backup services.
⚠️ Note: If your device has received Root rights or unlocked the bootloader, the standard update may not be installed or lead to loss of access to banking applications.
Check the stability of the Internet connection. For downloading large service packs (often exceeding 2-3 GB), it is better to use a reliable Wi-Fi network to avoid connection breaks and damage to the boot file.
Automatic update via the settings menu (OTA)
The easiest and safest way to get a new version of Android or MIUI is to use the built-in OTA (Over-The-Air) mechanism, which independently checks the servers for an up-to-date build that is suitable for your device ID, which does not require a computer or special knowledge.
To start the check, go to the Settings → About phone menu and click on the major icon of the MIUI version. If the update is available, the Download button will appear. Once the file is downloaded, the system will prompt you to restart and start installing, which can take from 5 to 15 minutes.
Sometimes the server hasn’t sent a push notification to your particular device yet, even though the new version already exists, in which case you can try clicking on the three dots in the upper right corner of the screen and select “Select a firmware file” if you already have an archive, or just wait a few days.
- 📲 Go to the Settings section of the main menu.
- 🔍 Click on About Phone (first on the list).
- 🔄 Touch the logo MIUI check out.
- ⬇️ Download and install the package by following the instructions on the screen.
If you need to customize your applications after installation, the system can suggest that you optimize their performance, and don't interrupt this process, even if it seems like a long time.
☑️ Ready for OTA-renewal
Manual Update installation via Recovery
If the automatic search doesn’t find updates, but you know that the new version of MIUI has already been released, you can use the manual installation method. This requires downloading the full firmware archive (Recovery ROM) from the official website or verified resources like MIUI Download Hub. The file should have the.zip extension and weigh about 2-3 GB.
Once you download the file, place it in the root of your smartphone's internal memory without packing it into additional archives. Then go back to the update menu (Settings → About phone), click three dots and select "Select firmware file." Find the downloaded archive and confirm the action.
⚠️ Warning: Make sure you download the firmware specifically for the Redmi Note 9 (codenamed merlin). 9S strictly prohibited and can cause the device to fail.
The system will check the integrity of the file and, if correct, suggest a reboot. Unlike OTA, this method often allows you to update through the version, even if the phased mailing has not yet reached your region.
What if you say “file cannot be verified”?
Comparison of Update Methods and Their Features
The choice of method depends on your goals and current situation. Automatic updates are suitable for most users who appreciate simplicity. Manual method through Recovery gives more control, but requires carefulness when choosing a file. There is also a method through Fastboot, which is used in case of serious failures or the need for a complete flashing with cleaning of all partitions.
The table below compares the main characteristics of various ways to upgrade the software on Xiaomi:
| Parameter | OTA (Automatically) | Recovery (Manually) | Fastboot (PC) |
|---|---|---|---|
| Difficulty | Low. | Medium | Tall. |
| Data retention | Yes. | Yeah (usually) | No (cleaning required) |
| The need for a PC | No. | Only for download. | I'll be sure. |
| Risk of error | Minimum | Medium. | High-pitched |
For ordinary users, it is recommended to adhere to the first two methods: Fastboot is only justified in cases where the phone is “hanging” on the logo or you need to change the region from Chinese to Global.
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Before you manually install the firmware through Recovery, copy an important archive file to your computer or the cloud. If something goes wrong in the process, you'll have a copy of the installer to try again.
Common Errors and How to Resolve Them
Redmi Note 9 users may experience a variety of problems during the upgrade process, and one of the common errors is the message “failed to update” which may be due to a corrupted download file, lack of space, or a conflict of modified system files.
If the phone is stuck on the MIUI logo after the update, try resetting to factory settings via the Recovery menu. To do this, turn off the phone and press the button combination Volume Up + Power before the logo appears. From the menu, select the language (English) and click Wipe Data → Wipe All Data.
- 📉 Memory Lack: Clear the app cache and delete large files before upgrading.
- 🔋 Battery discharge: If the phone is turned off during the upgrade, set it to charge on 30-60 minutes, then try to turn on.
- 🌐 Server problems: If the update doesn't load, change DNS In Wi-Fi settings or use a mobile network.
In rare cases, you may need to flash through your computer using the Mi Flash Tool utility.This is an extreme measure, requiring an unlocked bootloader and the presence of ADB drivers.
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If the update causes critical interface errors or quick battery drain, the best solution is a full reset (Wipe Data) after installing the new version.
Optimizing the system after updating
After successfully installing a new version of Android or MIUI, the system performs background optimization of applications, in the first hours or even a day after the update, the phone can run slower than usual and heat up more, this is a normal process of re-indexing files and adapting programs.
It is recommended not to load the device with heavy games immediately after the update, give the system time to complete the background processes, and it is also worth checking the battery settings, since the new version of the software can manage energy saving differently, and some applications may be limited in the background.
Be sure to check the functions that are important to you: calls, the Internet, GPS and cameras. If you notice strange behavior, try clearing the cache of a particular application or updating it through Google Play.
⚠️ Note: After a major interface update (e.g., switching from a MIUI 12 by 13 or 14) some settings can be reset to default values. Check notification and permission settings for messengers.