How to roll back the Xiaomi Redmi 9 update: the full guide

Xiaomi smartphone owners often face a situation when after installing a new version of MIUI, the device begins to work unstable, the battery discharges faster, lags appear in the interface, and familiar functions cease to respond correctly to commands. For the Redmi 9 model, this is especially true, since the transition between major versions of Android or major shell updates can cause conflicts in system files.

Reversing the system to an earlier version is an effective way to return the gadget to its previous performance and stability. However, this process requires careful adherence to the algorithm of actions so as not to turn the phone into a “brick.” Unlike a simple reset, a downgrade involves completely replacing the software with an older build.

There are several proven methods of returning to the previous version of the firmware, each of which has its own characteristics and requirements for preparation. We will consider the most secure and effective methods applicable specifically to the Redmi 9 line, so you can choose the best option for your case.

Why is it necessary to roll back firmware

The main reason why users are eager to roll back the Xiaomi update is the emergence of critical errors in the operation of the operating system. Developers do not always have time to test the software on all hardware configurations, which leads to problems for part of the audience. Redmi 9 often sees failures in the communication module or camera after the release of beta versions.

In addition, the new version of the shell can be optimized for more powerful hardware, which reduces performance on budget models, the interface becomes less responsive, and background processes begin to consume excess CPU life, this is especially noticeable in games or heavy applications.

Another factor is removing the usual functions or changing the logic of system applications. If the new version of MIUI radically changes the control to which you are used, going back to the old build is the only solution, and there are also often problems with autonomy, when the battery does not hold the charge as well as before the update.

⚠️ Note: System rollback is always associated with the risk of loss of personal data. Before starting any actions, be sure to create a full backup of contacts, photos and documents on an external medium or in the cloud storage.

It is important to understand that not all updates can be rolled back by standard methods. Xiaomi's security policy sometimes prohibits installing an older version on top of a new one without completely clearing the data. The bootloader can block the installation attempt if the antivirus or boot sector version is below the required one.

Preparation of the device and necessary tools

Before you start the active phase, you need to prepare the workspace and software. You need a Windows computer that is working. USB-With high-quality cable and a stable Internet connection, it is almost impossible to perform a full downgrade on Redmi 9 without a PC.

The key step is unlocking the bootloader. On Xiaomi devices, it is a prerequisite for installing global firmware or rolling back versions. The process takes 3 to 7 days and requires linking the Mi Account to the device through the developer menu.

You also need to download the official Mi Flash Tool and ADB/Fastboot drivers, which provide low-level communication between your computer and your smartphone, and without the right drivers, you won't see your phone in the right mode.

Remember to fully charge the battery. The flashing process can take anywhere from 10 minutes to an hour, and a sudden power outage at a critical moment can cause irreparable damage to the software part. It is critical to use the original cable or its quality counterpart, capable of withstanding prolonged load.

Find and download the right version of MIUI

The hardest part is finding the right firmware version. It has to be not only older than the current one, but also compatible with your region and device type. For Redmi 9 (codenamed lancelot for global version or merlin for global version). NFC-• the files are different and installing an incompatible image will cause an error.

Official sources, such as miui.com or the Mi Community forum, provide access to archives. You need a version that is Fastboot type (extension.tgz), not Recovery (.zip) if you plan to use a PC. The file title always contains a version number, such as V12.0.3.0.QJCMIXM.

When choosing a version, pay attention to the region at the end of the file title: MI - India, EU - Europe, RU - Russia, Global. Installing firmware from another region is possible, but it will require complete data cleaning and can affect the operation of banking applications or NFC.

Once the archive is loaded, it must be unpacked into the root of the C disk so that the path to the files is short and does not contain Cyrillic characters. Long paths or special characters in the folder names often cause errors in the Mi Flash Tool.

Recoiling with Mi Flash Tool (Fastboot Mode)

This is the most reliable way to completely rewrite the memory of a smartphone, which requires you to put the device in Fastboot mode. To do this, turn off the phone, then press the power and volume buttons at the same time until the image of a hare in headphones or the words Fastboot appear on the screen.

Connect your phone to your computer with a cable. Open the Mi Flash Tool and press the Refresh button. If the drivers are installed correctly, your Redmi 9 serial number will appear on the list. If the device is not identified, check the Windows Device Manager for unknown devices.

In the program interface, click "Select" and specify the path to the unpacked firmware folder. Make sure there are no Russian letters en route. At the bottom of the window, select firmware mode. For a clean rollback, the Clean all option is best, which erases all data and installs a new system.

Once you select the mode, press Flash. The process will go automatically. Don't turn off the cable or touch the phone until the green "Success" sign appears, at which point the phone will reboot itself to the new system.

Local Update via Recovery Menu

If unlocking the bootloader is not possible or you want to try a softer method, you can use a local update.This method works through the built-in recovery menu, but requires the firmware version to be not too old relative to the current one.

First, download the firmware archive in Recovery format (extension.zip). Rename the file to update.zip and place it at the root of the phone's internal memory. Then go to settings, select About Phone, and click on the MIUI version.

Click three dots in the corner of the screen and select "Select firmware file." Find your update.zip. The system will check compatibility. If the version allows rollback, an update button will appear. If not, the system will give a compatibility error.

⚠️ Note: This method is often blocked by security if you are trying to install an older version, in which case you can not do without unlocking the bootloader and using a PC.

In some cases, turning off the Internet before installing it helps, preventing the version from being checked from Xiaomi servers, but it does not guarantee success, since the signature verification takes place locally.

Error Resolving and (FAQ)

There can be errors in the rollback process, from driver problems to account locks. If the Mi Flash Tool gives an error at the end of the process, try another one. USB-A port or cable, often the problem is poor contact or power shortages.

If the phone is gone into an endless restart (bootloop), you need to enter Recovery mode (clamping the power and volume up) and reset to factory settings (Wipe Data), which will delete all data, but can restore the system to work.

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Use it. USB-port 2.0 on the back of a computer to connect a smartphone. 3.0/3.1 Sometimes cause problems with drivers of old devices when firmware.

If you lock your Mi Account (require password after firmware), make sure you log out before starting the procedure. If the phone is already locked, you will need to know the password from Mi Cloud to activate.

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The most common reason for failure is to try to flash a version for another region or model without first unlocking the bootloader and selecting Clean All mode.

Below are answers to the most frequent questions of users faced with the need to roll back the system on Redmi 9.