How to return the old firmware on Xiaomi Redmi Note 9 Pro

Modern updates to the MIUI operating system often bring not only new features, but also unpredictable errors that can significantly reduce the comfort of using a smartphone. Owners of the popular Redmi Note 9 Pro model often face a situation when, after installing fresh software, the device begins to run slower, discharge faster or critical interface bugs appear.

The process of downgrade (rollback) of the system requires careful and strict adherence to instructions, as improper actions can lead to data loss or software failures. You will have to choose between a relatively safe method through the recovery menu or a more complex method using the computer and Fastboot mode. Before starting any manipulations, it is extremely important to be aware of the risks and prepare all the necessary files in advance.

In this article, we will discuss in detail the algorithms for rolling back firmware on Xiaomi, paying special attention to the nuances of working with recovery sections. We will look at the preparation of the device, finding the right archives and Step-by-step performing the flashing procedure. A competent approach will allow you to return the functionality of the gadget without contacting the service center.

Reasons for rollback of the MIUI version and device preparation

The need to return the previous version of the operating system can arise for various reasons related to the optimization of the hardware of the smartphone. Often new builds contain errors in the code of drivers or system services, which leads to overheating of the processor or unstable operation of communication modules. Users notice that after the update, the battery holds a charge much worse, and applications fly out more often than usual.

Another common reason is to remove familiar features or change the interface, which many find uncomfortable. Developers can eliminate certain customization options or change the logic of notifications, which is a critical disadvantage for the experienced user.

⚠️ Attention: Downgrade procedure almost always involves the complete removal of all data from the internal memory of the device.

Before starting the action, you need to perform a number of preparatory actions, ignoring which can make the phone unusable, make sure that the battery charge is at least 60%, as a sudden power outage during writing data to memory can lead to irreversible damage to the system partition.

You also need to find and download the exact version of the firmware you plan to upgrade to. The archive should be full (Recovery ROM), not an update (Update ZIP), and match the region of your device. Check the exact model of the gadget in the settings, so as not to confuse the global version with the Chinese or Indian, as mixing them often causes errors.

Choosing the Downgrade Method: Recovery or Fastboot

There are two main ways to install old firmware on the Redmi Note 9 Pro, each with its own features and hardware requirements. The first method is done directly through the smartphone recovery menu and does not require a connection to the computer, making it more accessible to beginners. However, this method has a serious limitation: the official MIUI shell prohibits rollback to an earlier version without an unlocked bootloader.

The second method involves using a PC, special Mi Flash Tool software and switching the phone to Fastboot mode, which is more versatile and allows you to flash the device even with a locked bootloader if the software version allows you to do this according to the security policy, but the risk of turning the phone into a brick here is higher if you choose the wrong file or interrupt the process.

If you plan to use the method through a computer, you will need to install ADB/Fastboot drivers and utilities to work with Xiaomi devices. Without properly installed drivers, the computer will not be able to recognize the smartphone in boot mode, and the firmware will not start the writing process.

Search and preparation of firmware archive

The key to successful recovery is finding the right system image file. You need to find the full firmware (Full ROM), which typically weighs between 2 and 3 gigabytes, rather than a small update weighing several hundred megabytes.

You should only download files from trusted sources, such as the official website miui.com or authoritative forums specializing in Xiaomi technology. Using modified builds from unknown authors can lead to leakage of personal data or the introduction of malicious code into the system. Always check the checksum of the file, if such an opportunity is provided by the source.

For the Recovery method, the firmware file must be renamed update.zip and placed in the root directory of internal memory or on a microSD card. If you use a computer, the archive must be unpacked, since the Mi Flash program works with a folder containing many files, not with a single archive.

• 📂 Make sure the path to the firmware file does not contain Cyrillic characters or spaces to avoid read errors.
• 💾 Check the free space on the device: for the correct unpacking and installation requires a minimum 5-6 GB of free space.
• 🔍 Compare the firmware region (Global, EU, RU, India) with the region your phone is configured to avoid software conflicts.

Once the file is uploaded, it is recommended to check its integrity. A damaged archive can lead to an installation error or, worse, to a partial record of data, which will make the system unstable. If the file is downloaded again, repeat the verification procedure.

Instructions: Recoil through the Recovery menu

This is the simplest method, but it only works if the firmware version you want to install is newer or equal to the current one, or if you use a special engineering menu. The standard recovery menu often blocks the installation of the older version, giving the error "Can't verify update." However, it is worth trying this way.

To enter recovery mode, turn off your smartphone and press the Volume Up and Power key combination. Hold the buttons until the MI logo appears, then release the power button, while continuing to hold the volume. From the menu that opens, select the language (usually available in English and Chinese) and go to the installation point.

Select Install Update (or "Install ZIP from SD" depending on the version of Recovery), find the update.zip file and confirm the action. The system will start checking the file and, if the version allows, start the update process. The screen can go out and light up several times - this is normal behavior.

⚠️ Note: If after selecting the file you see a message about the impossibility of verification or prohibition of installation, then the security policy MIUI It blocks the downgrade, and in this case, only the method using the Fastboot and the unlocked bootloader will help.

Once the installation is complete, the device will suggest restarting. The first run can take up to 10-15 minutes as the system optimizes applications and creates new caches. Don't panic if the phone hangs on the logo for a long time - give it time to complete internal processes.

Fastboot and Mi Flash Tool

If the standard method didn't work, you'd have to use a more powerful tool called Fastboot, which allows you to interact with the memory partitions of your phone directly, bypassing the limitations of the operating system, USB-Good quality cable and installed Mi Flash Tool.

Put your smartphone into Fastboot mode, turning it off and pressing the Volume Down and Power buttons simultaneously, and the screen will show a picture of a rabbit in a hat fixing an android, indicating that you successfully enter boot mode. Connect your phone to your computer and launch Mi Flash.

In the program interface, click the "Select" button and specify the folder with the unpacked firmware. Make sure there are no Russian letters on the way to the folder. At the bottom of the window, select the mode of operation: for a clean downgrade, the Clean all option is best, which will completely delete the data.

• 🚀 Press the Flash button to start the process of writing data to the device memory.
• ⏳ Expect completion: progress bar will be filled, and commands will appear in the log - do not interrupt the process.
• ✅ After a successful firmware, a green “Success” will appear, and the phone will automatically restart.

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Use the original. USB-cable and connect the phone directly to the motherboard port (back of the system unit), avoiding USB-Hubs and front panels to avoid communication breaks.

It is important to understand that newer versions of MIUI with Anti-Rollback protection enabled may not be physically possible to install an older version without unlocking the bootloader. If the bootloader is locked and the protection is active, the program will give an error and you will not be able to continue.

Problems with Anti-Rollback and unlocking the bootloader

Starting with certain versions of MIUI, Xiaomi has implemented an Anti-Rollback protection mechanism that prevents the installation of older versions of the firmware for security purposes.This mechanism checks a special tag in the bootloader, and if you try to install software with a lower protection index, the device may stop turning on.

This restriction can only be circumvented through the official Unlock Bootloader, which requires an application via the Mi Unlock app, a device-based Mi Account, and a wait of 7 to 30 days, and the bootloader unlocks once the permission is obtained, allowing any version of the software to be installed, including custom recovery.

Unlocking the bootloader automatically drops all data from the phone and removes the security guarantees of some banking applications, although for most users this remains unnoticed once set up.It's the only legal way to gain full control of the file system of your Redmi Note 9 Pro.

⚠️ Warning: Trying to flash old firmware onto a device with active anti-Rollback protection without unlocking can lead to a “hard brick” when the phone stops responding to buttons and requires programr soldering to recover.

Before deciding to unlock, weigh the risks. If your goal is simply to remove the current version bug, it may be easier to wait for the next official update that fixes the bugs than to risk the device’s warranty and stability.

Frequently Asked Questions (FAQ)

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Downgrade firmware is an effective but risky method of restoring operability, requiring mandatory data backup and accurate selection of the software version.