How to Sweat Xiaomi Redmi Note 9: The Complete Guide

Xiaomi smartphones are famous for their value for money, but even the reliable Redmi Note 9 sometimes requires software intervention. Users often face situations when the device starts to work unstable, there are intrusive system errors or just want to upgrade to a newer version of Android, which has not officially arrived in your region.

The process of installing a new operating system may seem intimidating to a beginner, but modern tools from a Chinese manufacturer make this task as simple as possible. You do not need to be a software engineer to perform a Flash procedure, follow the algorithm carefully enough and have a good computer with Internet access on hand. It is important to understand that any manipulation of system files carries certain risks, so preparation is a key stage of success.

In this material, we will discuss in detail all available methods of software update, from regular OTA-You'll learn how to properly prepare the device, what drivers are needed, and how to avoid common bugs that turn the phone into a brick. Let's start with the theoretical framework and toolkit preparation.

Preparing a smartphone and computer for flashing

Before you start active, you need to ensure a stable connection between your PC and your mobile device. To work with system partitions, you will need a good quality USB Type-C cable, preferably original or certified, since cheap counterparts often do not withstand the necessary current or do not support data transfer. The computer must run Windows operating system version 7 or higher, since the ADB and Fastboot drivers work best in this environment.

A critical step is to back up all user data. During the firmware process, especially when changing region or firmware type (e.g. China to Global), internal memory will be completely cleared. Save contacts, photos and documents to Google Drive cloud storage or external storage so that important information is not lost forever.

Also make sure that the battery charge of the smartphone is at least 60%. interruption of the process of writing system files due to battery discharge can lead to irreversible damage to the bootloader. On the computer, it is recommended to disable antivirus software while installing drivers, as they can be falsely identified as a security threat.

Don't forget to check the integrity of the firmware file itself. If you download a system image from a third-party resource, be sure to check the checksum (CRC32 or MD5) against the original on the official forum. A damaged archive can cause an error when unpacking or, worse, when writing to the device's memory.

Selection of firmware type: Global, China and Recovery

Xiaomi’s firmware world is divided into several major categories, and understanding these differences is essential for the right choice: Global ROM is designed for the international market, has built-in Google Play, supports many languages and lacks Chinese software. It is the optimal choice for most users outside of China, ensuring stable operation of all services.

China ROM versions are designed for the domestic market, often coming out ahead of global counterparts and contain exclusive features, but they lack Google’s default services, and may also have trouble with notifications due to aggressive energy saving, requiring additional manipulations to localize and install Google services.

⚠️ Note: Installing the Chinese version of the firmware on a global device (or vice versa) without an unlocked bootloader is impossible and may lead to locking the device during the boot phase.

Also firmware is divided by installation method: Recovery and Fastboot. Recovery-version has extension.zip and is installed through the recovery menu or built-in updater. Fastboot-version (.tgz) is designed for low-level installation through the computer and allows not only to update the system, but also to completely clean all partitions, which is useful when switching between regions.

Method One: Update with Recovery Menu

This is the easiest and most secure way to do this, because it doesn't require a computer connection or an unlocked bootloader, and it's ideal for upgrading within the same region or rolling back to an earlier version of the same software thread. First, you need to upload a.zip firmware file to the root directory of the smartphone's internal memory.

After downloading the file, go to the Settings menu → About the phone and click on the version MIUI. In the window that opens, select the three dots in the top right corner and find “Select firmware file.” The system will ask for a reboot confirmation, and then the verification and installation process will begin.

If the standard method through the settings doesn't work, you can use Recovery mode manually. To do this, turn off your phone and press the Up + Power button combination. In the menu that appears, select the language (if available) and click "Install Update From" → "Choose zip from internal storage." Find your file and confirm the action.

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Recovery only works if the bootloader version allows installation (you can’t usually downgrade the Android version or change the region without unlocking).

The process can take anywhere from 5 to 15 minutes, which will show the MIUI logo and progress bar, and do not interrupt the process or press buttons until the device itself restarts to the operating system.

Method Two: Installation with Fastboot and Mi Flash Tool

For deeper intervention, region change or recovery after serious failures, you will need the Mi Flash Tool utility and firmware in.tgz. This method requires an unlocked bootloader, the process of obtaining which is described on the manufacturer's official website. First, unpack the archive with the firmware in the root of the C disk so that the path does not contain Cyrillic characters.

Put your smartphone into Fastboot mode by pressing Volume Down + Power buttons before the image of the hare appears in the headphones. Connect the device to your PC and launch the Mi Flash Tool on behalf of the administrator. Press the Refresh button to allow the program to detect your device.

In the program interface, select the path to the folder with the unpacked firmware. Pay special attention to the choice of firmware mode in the lower right corner: Clean all will clean the data completely, Save user data will try to save it, and Clean all and lock will block the bootloader (use only with the original firmware!).

Press the Flash button and wait until the process is complete, the program log will display the steps of writing partitions, and the successful completion will be indicated by the green “Flash Done”, after which the phone will automatically restart.

Solving problems and errors in firmware

Even with strict follow-up, unexpected situations can occur, and one of the most common errors is "Device not found" in the Mi Flash Tool, which indicates a driver problem. You need to go to Windows Device Manager, find a device with a yellow exclamation mark (often marked as QUSB_BULK or Android), and manually update the driver, indicating the path to the folder with Qualcomm drivers or ADB.

Another common problem is the “Anti-rollback” error: Xiaomi’s protection system prevents you from rolling back to a lower version of Android than you currently have if the anti-rollback index has been increased, and this will lead to a “bricking” of the device that can only be restored in the service center through the boxed version of the software.

⚠️ Warning: If your phone goes into Bootloop after you have firmware, try a full Wipe Data reset via Recovery Mode. If that doesn't work, reflash the device with the Clean All option.

Users often face the problem of "Widevine". L1», When they stop working after the reworking HD-It's when you install global firmware on a Chinese machine or when you unlock the bootloader. L1 In such cases, software is almost impossible.

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If the Mi Flash Tool is in error 0xdeadcode Or similar, try it. USB-port (preferably) USB 2.0) and other cable, as the problem is often an unstable connection.

Frequently Asked Questions (FAQ)