The procedure for reinstalling the operating system on a smartphone may seem difficult only at first glance, but for owners of Xiaomi Redmi Note 9 Pro this is often the only way to bring the device back to life after a failed update or software failures. Modern gadgets of the brand are built on the architecture of Android with a shell MIUI, which has specific features of downloading and data protection, requiring strict adherence to the algorithm of actions. If your device suddenly began to work slowly, freeze or completely stopped turning on, competent firmware can eliminate software errors that are not solved by a conventional reset.
There are several ways to restore the system, each of which depends on the current state of the phone and the availability of superuser rights. You can use the standard restore menu that is built into each device, or use more advanced tools like Fastboot and Recovery TWRP. The choice of the specific path depends on whether the bootloader is locked, whether the settings menu is available and what kind of result you want to get — a return to factory settings or install custom Android build.
Before you start taking action, you need to be clear about the risks and prepare all the necessary components, as interruption at any stage can lead to irreversible consequences. In this article, we will discuss in detail the preparation of the computer, installing drivers, working with official utilities from the manufacturer and manual firmware methods that service centers use. Careful study of the material will allow you to avoid typical errors and successfully revive your Redmi Note 9 Pro.
The initial stage of any serious work with the software of the smartphone is a thorough preparation of the workplace and the gadget itself. You will need a Windows computer, as most specialized utilities, such as the Mi Flash Tool, do not support macOS or Linux without complex manipulation. USB-cable capable of transmitting data, not just charging the battery, as an unstable connection will cause an error in writing system files.
The next critical step is to back up all user data, as the flashing process involves fully formatting internal memory. Photos, contacts, instant messaging and files will be permanently lost if you don't copy them in advance to a cloud server or external drive. It is recommended to use the built-in MIUI backup function or third-party applications to create a full snapshot of the system.
To work with your computer, you need to download and install the current ADB and Fastboot drivers, which provide communication between Windows OS and the phone hardware in debugging mode. Without these components, the computer simply will not see the smartphone in the desired mode, and no commands will be executed. It is also worth downloading the firmware file itself corresponding to your model, checking the region (Global, Europe, Russia) and the type of bootloader (Locked or Unlocked).
⚠️ Note: Use of unoriginal cable or connection via USB-The hub can cause a connection to break at a critical point in the bootloader’s recording, which will turn the phone into a “brick».
Unlocking the Bootloader bootloader
The official firmware of Xiaomi devices often requires an unlocked bootloader, especially if you plan to move between regional versions (for example, from Chinese to global) or install customized Recovery. The bootloader is a small program that runs before the operating system turns on and checks the digital signatures of the downloaded software. If the signature does not match the reference or the firmware region does not correspond to the region of the device, the boot process will stop.
The unlocking process takes time and requires you to link your Mi Account to your device, log in to your phone’s settings, activate developer mode, and link your account to that particular smartphone in the “Mi Unlock Status” menu, and then wait 7 to 168 hours (depending on company policy at the time of application) before the server allows you to unlock.
What do you do if your status is frozen?
If the unlock status is stuck during the checkout phase, try switching from Wi-Fi to mobile Internet or vice versa. Also helps login via mobile data in the Mi Unlock Status menu, and not through the standard Settings app. Sometimes you need to delete the account from the phone, reboot and re-tether.> To directly unlock the Mi Unlock Tool utility on your computer. The phone is transferred to Fastboot mode simultaneously by pressing the volume button and power button, then connects to the PC. The program will check the account status and, if time expires, execute a command to erase the security keys on the waiting procedure. ⚠️ Note: After unlocking the bootloader, some banking applications and services of Google Pay (Mir Pay) cease to work, as the integrity of the security system is violated. Install official firmware through Recovery The safest and easiest way to update or restore the system is to use the built-in Recovery mode. This method does not require an unlocked bootloader and works even if the Android operating system is damaged, but the recovery section is intact. To enter this mode, you need to turn off the smartphone and press the power and volume buttons simultaneously until the Mi logo appears. In the Recovery menu, navigation is carried out by volume buttons, and the choice is confirmed by the power button. You need to select the "Wipe Data" option for full cleanup, then "Connect with MiAssistant" or simply install the firmware file if the menu supports working with the user. ZIP-But most of the time, standard Recovery can only be installed. OTA-Updates or full firmware in format ZIP, downloaded in advance. If you use the installation method ZIP-Make sure the firmware version is newer or equal to the current one, otherwise the system may reject the installation due to anti-rollback protection. SD-The process takes a few minutes, after which the phone automatically restarts.Fastboot and Mi Flash Tool firmware Fastboot is the most powerful tool in the arsenal of repair specialist Xiaomi. It allows you to write system parts directly, bypassing the limitations of Android, and is necessary to switch between regions (for example, CN to Global) or recover from serious crashes. This method requires an unlocked bootloader and the presence of a firmware file in ZIP format, which you need to pre-unpack into a folder without the Cyrillic characters in the name. After connecting the phone in Fastboot mode (the screen with a hare repairing an android) and running the Mi Flash Tool utility, you need to choose the path to the unpacked firmware. In the lower right corner of the program, it is important to select the correct mode of the firmware, you will lock the data back, and the user will try to lock the data back up the "all" if the "clean" (all" - locks, "all" - "lock the data is closed "all" - lock" - "locked" - "all" - "all" - "locked" - "all" - "all" - "all" - "all" - "locks the data is used to lock" - "all" - Firmware mode Save Data bootloader Status Clean all Reset Recommendation Clean all No (full reset) Remains unlocked Recommended for clean installation save user data Yes Remains unlocked Only when clean all and lock version is updated No (full reset) Blocked Only for official Press the Flash button and wait for the process to be completed, which usually takes 200 to 600 seconds, during which time it is strictly forbidden to turn off the cable or interrupt the power of the computer. Successful completion will be marked by a green bar in the program interface and the message “Flash Done”, after which the phone will go into boot mode of the new system. 💡Using the “clean all and lock” mode on unofficial firmware will lead to a locking of the device (Hard Brick), which can be restored only through paid services. Installation of custom Recovery TWRP For advanced users who want to gain full control of the Redmi Note 9 Pro, install a modified bootloader is available. TWRP. This allows you to install custom firmware (LineageOS, Pixel Experience), make full system backups (Nandroid backup) and get root rights. TWRP It is only possible on a device with an unlocked bootloader and requires the use of a command line. ADB. The process starts with putting your phone into Fastboot mode and connecting to a PC, and you put a command through the console to run the image of the recovery. It's important to note that different versions of Android (Android 10, 11, 12) may require different versions. TWRP, The file must be tailored to your current or target version of the system. fastboot flash recovery twrp-3.x.x.x-curtana.img fastboot boot twrp-3.x.x.x-curtana.img After the command, the phone will immediately boot into mode. TWRP. If you just reboot the device in the standard way, the original recavery can overwrite. TWRP, Therefore, the first login to the system must be done through the Recovery menu (volume buttons). + The power supply is adb reboot recovery command. TWRP can be installed ZIP-archive with firmware, pre-made Wipe Data, Cache and Dalvik. 📊 What type of firmware do you prefer?Official MIUIXiaomi.eu (mod)Pure Android (AOSP)Stock Root Address common bugs and problems In the process of flashing, users often encounter errors that can scare the inexperienced person. One of the most common problems is the error "Waiting for device" in the Mi Flash Tool. This means that the computer does not see the phone in Fastboot mode.The solution lies in installing the right Qualcomm or Xiaomi drivers. USB Driver, and in replacement USB-cable or connection port (preferably using ports) USB 2.0 on the back of the PC. Another common problem is the "Anti-rollback check failed" error, which is a security mechanism that prevents you from installing an older version of the firmware on top of the new one. If you try to roll back, the process will be interrupted. The only way to get around this limitation is to use special tools. EDL (Emergency Download Mode, which is often paid and requires a high-access account authorization, may also result in a phone stuck on the Mi logo (Bootloop), and most of the time, logging into Recovery mode and executing the "Wipe Data" command helps». If this does not help, the userdata partition may be damaged, and a complete flashing through the Fastboot is required to clean all the data (eMMC/UFS) memory. ⚠️ Warning: If the phone goes into an endless reboot after trying firmware, don't panic. 10-15 seconds for a forced reboot or log in to Fastboot to try again. Frequently asked questions (FAQ) Can I re-follow the Redmi Note? 9 Pro without unlocking the bootloader? Yes, it's possible, but only within one region. You can update the official firmware through the System Update menu or install full versions (Recovery) ROM) You can't go from China to Globalka or install custom assemblies without unlocking. IMEI post-flashing? When using official methods and original firmware IMEI It is saved because it is written into a secure partition that is not affected by standard utilities, but the use of handicraft tools or improper manipulation of the persist partition can lead to loss of the user's ability to use the tools. IMEI Where can I download secure firmware for my model? The only safe sources are the official miui.com website, the built-in update menu on my phone, or proven aggregators like XiaomiFirmwareUpdater. Avoid random forum files without a digital signature, as they may contain malicious code.What to do if the Mi Flash Tool gives an error 0xc000007b? This error is usually due to the lack of required Microsoft Visual C libraries.++ computer-based. You need to download and install the redistributable package (versions 2015-2022) from the official Microsoft website, corresponding to the bit size of your system (x86 or x64).