How to install a new firmware on Xiaomi Redmi 9: the complete guide

Redmi series smartphones have been leading the budget segment for many years, but over time, even the most reliable Android begins to require updates. Owners of the Redmi 9 model often face the need to reinstall the operating system to correct errors, remove ads or simply to get fresh features of the MIUI interface. Properly executed procedure allows you to extend the life of the device and return it to the performance that was in the first days after purchase.

The process of replacing software may seem difficult for a beginner, but with strict adherence to the algorithm of actions, the risk of damaging the device is minimal. It is important to understand that there are different methods: from simple updating "over the air" to deep flashing through the computer using special utilities. The choice of the specific method depends on the current state of your gadget and the goals you set for yourself.

In this article, we will discuss in detail all the stages of preparing, downloading the necessary files and installing the new version of firmware directly. We will pay special attention to the nuances of working with Recovery mode and Fastboot mode, since this is where users often have questions. A careful study of the material will help you avoid typical errors.

Device preparation and data backup

Before you start any manipulation of system files, you need to protect your personal data. Installing new firmware, especially by a complete cleanup method, will inevitably lead to the removal of all photos, contacts and applications. Therefore, creating a backup is the first and most important step that should not be ignored.

The easiest way to save information is to use cloud services. Built-in sync with a Google or Mi Cloud account allows you to quickly restore contacts, notes and calendar after reinstalling the system. Photos and videos are best suited for Google Photos, which automatically uploads media files to the cloud when you have a Wi-Fi connection.

Besides the cloud, it is recommended to copy heavy files, such as movies or document archives, to a computer or external drive. USB-cable, select file transfer mode MTP And manually copy the folder. DCIM It's a little time-consuming, but it's going to keep the data safe even if you're out of sync.

💡

Before starting the procedure, be sure to remove the microSD memory card, if it is installed, so as not to accidentally format it during the work with system partitions.

Determination of firmware type and regional affiliation

One of the most common mistakes is installing firmware designed for a different region. Global ROMs differ from China ROM not only in their language set, but also in their system application structure. If you try to install Chinese firmware on a global device without an unlocked bootloader, the process will end in error.

To find out the current version, go to Settings → About Phone. Notice the letter index at the end of the version number: MI stands for the international version, RU for the Russian version, and CN for the Chinese version. It is also important to consider the type of bootloader: Recovery allows you to install only official updated versions, and Fastboot requires unlocking and allows you to put any compatible images.

The official website of the manufacturer or specialized forums such as 4PDA or XDA Developers are the most secure options. Using files from third-party file sharing companies can lead to malware infection or installation of a modified system with unstable operation.

Method 1: Update via Recovery Menu (without PC)

This method is the easiest and most secure, as it does not require a computer or special knowledge. It is suitable in cases where the phone is turned on, it is stable, and you just need to upgrade to a newer version or switch from one global version to another (for example, from Indonesia to Global).

First, download the firmware archive and place it in the root of the device's internal memory. Don't put the file in folders, otherwise the system won't see it. Then go to Settings → About Phone and click on the MIUI version. In the window that opens, click on the three dots in the upper right corner and select Select the firmware file.

⚠️ Note: If the system says "Impossible to Update" or "File is corrupted," chances are you're trying to install an older version or firmware for another region without superuser rights.

Once the file is selected, the phone will suggest restarting for installation, taking 5 to 15 minutes, during which time the Redmi logo and progress bar will be displayed on the screen, during which time it is strictly forbidden to interrupt power or press buttons, as this can lead to a system partition resolution.

💡

The menu update method only works if you don’t downgrade the Android version and change region from Global to China without unlocking the bootloader.

Method 2: Installation with Fastboot and Mi Flash Tool

To deepen your flashing, change region, or restore your device after a failed experiment, you'll need a computer and a Mi Flash Tool, which allows you to install the system cleanly, ignoring old errors and file conflicts, and you'll need to download the utility itself, Qualcomm or ADB drivers, and a firmware image in.tgz format.

Unpack the firmware archive at the root of the C disk so that the path to the folder is short and does not contain Cyrillic. Launch the Mi Flash Tool on behalf of the administrator and connect the phone to the PC by holding the volume down button. In the Device Manager, the device should be identified as Android Bootloader Interface.

fastboot devices

This command in the command line will help check the connection with the device. If the serial number is displayed, click the Refresh button in the program and select the path to the firmware folder. Before starting, select Clean all mode for guaranteed results, then press Flash.

Solving typical problems and errors in firmware

Even with careful preparation, there can be unexpected situations. One of the common problems is hanging on the Bootloop logo. If the phone reboots endlessly, try resetting through Recovery: press the power and volume button up, select Wipe Data and confirm the action. This will delete all data, but often saves the system.

Another common error is Error 7 or the message of incompatibility when updating through Recovery. This occurs when you try to roll back a version or install custom build on top of the stock without unlocking, in such cases, only switching to the method from Fastboot and pre-unlocking the bootloader through the official Mi Unlock website helps.

• 🔌 Problem: The computer does not respond to the connection in Fastboot mode.Solution: Replace USB-cable, try the ports behind the system unit, install drivers manually.
• 📉 Problem: The firmware is up, but the network is not working or IMEI. Solution: Modem partition is likely to have been damaged; restoration is required via an engineering menu or service.
• 🔋 Problem: The phone turned off during the process and won't turn on.Solution: Press the power button on 15-20 seconds for forced reboot or connect to the charger for a long time.

💡

If the phone is slow after firmware, give it 30-40 minutes at rest. The system performs background optimization of applications and files, which in the first minutes after installation creates a load on the processor.

Set up the system after successful installation

After you successfully complete the procedure and first download, you will see a welcome screen. Don't rush to restore all applications from the backup immediately. First check the basic functionality: sensor, speakers, microphone and cameras. Make sure the Android and MIUI versions are displayed correctly in the settings.

It is recommended to immediately disable ads in system applications if you use global firmware. Go to the settings of each system application (Security, Downloads, Music) and find the Receive Recommendations switch or MSA. This will significantly improve the user experience and reduce battery load.

⚠️ Note: When recovering data from the cloud, do not select "Restore System Settings" if you have switched from another version of Android.This can bring back old conflicting configuration files and cause instability.

Set up geolocation, app permissions, and update all programs through Google Play. Only then can you start installing custom content. The right initial setup will ensure that Xiaomi Redmi 9 will work consistently for a long time.

Frequently Asked Questions (FAQ)