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

Modern smartphones require regular software updates to ensure stability and security. Xiaomi Redmi 9T (also known as Poco M3 Pro in some regions) is no exception and periodically needs to be flashed, this may be necessary if you experience software failures, need to change the firmware region or want to upgrade to a newer version of MIUI.

The process of installing a new operating system requires care and preparation. Mistakes in downloading files or connecting a cable can lead to undesirable consequences. In this article, we will discuss in detail all the steps from downloading a system image to final configuration of the device after successful installation.

Before you start taking action, you need to clearly understand what kind of recovery or upgrade method is right for you. There are several ways: through the built-in menu, through Recovery mode or using the computer in Fastboot mode.

Preparation for the firmware procedure

The initial phase is critical to the success of the entire operation, you need to make sure that the battery is at least 60 percent charged, the process of flashing power, and suddenly turning off power in the middle of the data record can damage the bootloader.

It will also require quality USB-cable, preferably original and serviceable USB-Do not use the front ports of the system unit, as they may not provide enough voltage.

Make sure to back up all your important data. When you install a new firmware, especially when you change region or type of memory, the internal storage will be completely cleaned. Keep your contacts, photos and documents in the cloud or on external media.

• 🔋 Charge the device to minimum 60-70% steady-work.
• 💾 Make a full data backup via Mi Cloud or on your computer.
• 🔌 Prepare the original. USB-cable and serviceable PC port.
• 📥 Download the current firmware image for your model.

⚠️ Note: Make sure that the downloaded firmware is designed specifically for Redmi. 9T (Installing firmware from other models, even those with similar characteristics, is guaranteed to bring the device down.

Check the space available on the internal drive if you plan to update through the file. Archivers and unpackers may need several gigabytes of free space beyond the size of the firmware file itself to work properly.

Selection of firmware type and installation method

There are several types of firmware in the Xiaomi ecosystem, and it is important to distinguish between them. The global version (Global) is designed for the international market, has built-in Google services and support for many languages. The Chinese version (China) often comes out earlier, but does not have a pre-built Google Play and may contain frequency restrictions.

Also firmware is divided by installation method: Recovery and Fastboot. Recovery firmware has a.zip extension and is installed directly through the phone menu or standard updater. Fastboot firmware has a.tgz extension and requires a connection to a PC using special software.

If your phone is turning on and working normally but you want to upgrade, the easiest way to do this is to use Recovery, and if the device is hanging on the logo or not booting, you will need Fastboot mode and a computer.

It is important to understand the difference between a clean installation and a data-saving upgrade: When you switch from one version of Android to another or change region (for example, from China to Global), data storage is impossible – you will need a complete reset.

Method 1: Update via Recovery (without PC)

This is the safest way for beginners and doesn't require a computer, but it's suitable for updating within a single region or installing official firmware on top of an existing one. You'll need a firmware file in.zip format.

Download the current firmware archive for Redmi 9T from the official website or a trusted resource. Put the file in the root of the device's internal memory. Don't put it in folders, use the root directory to avoid search errors.

Next, go to Settings → About Phone and click on MIUI. In the window that opens, click on the three dots in the upper right corner and select Select Firmware File. The system will find the archive and prompt you to start the update.

Once confirmed, the file and installation process will begin, the phone will automatically restart, and don't interrupt this process even if the screen goes out, which is when system partitions are recorded.

⚠️ Note: If the system says "Impossible to update" when selecting a file, it means that the version in the archive is older or equal to the current one, or the firmware region does not match.

Method 2: Installation via Fastboot from a computer

Fastboot is the most powerful tool in the service engineer’s arsenal, allowing you to completely rewrite all memory partitions, which effectively solves problems with software errors, cyclic reboots and “bricks”.

You'll need Mi Flash Tool and ADB/Fastboot drivers to work, download and install them on your computer, and you'll need unpacked firmware in.tgz format. It's important that the path to the firmware folder is free of Cyrillic characters and spaces.

Put your smartphone in Fastboot mode. Turn the device off completely, then press the volume button and hold it, connect the cable to the computer. The screen will show a picture of a hare repairing an android.

fastboot devices

Enter this command in the command line (opening the adb driver folder beforehand) to make sure the computer sees the device. If the serial number is displayed, you can run the Mi Flash Tool.

In the program, click select and point the path to the folder with the unpacked firmware. In the lower right corner, select clean all mode. Press flash and wait for the process to be completed, which will take 200 to 500 seconds.

Comparison of methods and possible errors

Each method has its advantages and risks. Recovery is preferred for the average user because of its simplicity. However, it is less effective in case of serious system failures. Fastboot gives full control, but requires precision in operations.

Often users encounter a “Missmatching image and device” error, which means that you are trying to install firmware from another model or region that is blocked by the bootloader, in which case you need to unlock the bootloader through the official MIUI website.

If the progress bar is stuck at a certain percentage for more than 5 minutes during installation via Fastboot, don't panic. Sometimes the system checks partition checksums. However, if the time is up, try reconnecting the cable and starting the process again.

Actions after installation and setup

Once the firmware is successfully installed, the phone will restart. The first run can last up to 10 minutes, which is normal, since the system optimizes applications and cache. Don't try to speed up the process by pressing buttons.

Go through the initial setup. If you've done a full reset, the system will suggest you restore data from a Mi Cloud backup or Google Account, which is a convenient way to get your contacts back and your app settings back.

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After the first download, go to the display settings and set the refresh rate of 60 Hz or 90 Hz depending on your preferences, as after firmware settings can be reset to standard.

Be sure to check the basic modules: camera, speaker, microphone and sensor. Sometimes after flashing, you need to calibrate the sensor, which can be done through the engineering menu by typing code ##6484##.

Make sure there are no critical errors in the system. Go to Settings → About the phone and check the build version. It should match the one you installed. If the version is old, then the installation did not go well.

⚠️ Attention: In the first hours after firmware, the battery may run out faster than usual, due to background indexing of files and system optimization. 1-2 charge-discharge cycle.

Frequently Asked Questions (FAQ)

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The main key to success is the use of the original cable and the exact match of the model (lime) to the downloaded firmware file.