Installing firmware on Xiaomi with a blocked bootloader: the full guide

Modern Xiaomi smartphones are famous for their flexibility in setting up, but often users are faced with the need to reinstall the software.This may be necessary to fix software errors, return to factory condition or upgrade to a newer version of MIUI or HyperOS. However, if the device bootloader is locked, standard firmware methods become unavailable, which baffles inexperienced users.

In this article, we will discuss in detail how to install firmware on devices with a locked Bootloader. You do not need to look for workarounds or use questionable utilities, since we will focus exclusively on legal methods supported by the manufacturer. Understanding these processes will allow you to restore the health of your smartphone without the risk of turning it into a brick.

It is worth noting that the term “locked bootloader” in the context of Xiaomi means the inability to write to system partitions without special permission from the company’s servers. Official firmware can be installed even when BL is blocked, but the choice of methods is significantly narrowed. We will consider two main ways: updating through the built-in Recovery menu and flashing through Fastboot using the Mi Flash Tool in Clean All mode (without unlocking).

Features of blocking the bootloader on Xiaomi devices

Bootloader is a small program that starts before the operating system starts and checks the integrity of its components. Xiaomi, Redmi and POCO smartphones have defaulted on protection that prevents the installation of modified software, a security mechanism designed to protect user data from theft and prevent the installation of malicious software at a deep level.

When the bootloader is locked, the system checks the digital signature of each firmware being installed, and if the signature doesn't match the manufacturer's keys, the installation process will be interrupted, which is why you can't just take any firmware downloaded from the Internet and install it through a standard menu, and digital signature is a key element of software authentication.

It is important to distinguish between “unlocked” and “locked” BL. In the first case, the user gets full access to the file system and can install customized recaps (TWRP) and modified firmware. In the second case, only official images signed with Xiaomi keys are available. Attempting to install a custom build on a blocked bootloader will lead to a verification error and a refusal to update.

⚠️ Warning: Attempts to use third-party tools to “hack” or bypass bootloader verification (e.g, EDL-methods with paid accounts can lead to irreversible locking of the device IMMI Or hardware failure. Use only official methods.

For most users who want to simply upgrade or restore the phone after a crash, unlocking the bootloader is not required. It is enough to know the correct algorithm for actions with official tools. Mi Flash Tool and built-in updater can work in such conditions, if certain conditions are met.

Preparation of the smartphone and computer for the procedure

Before any manipulation of system software begins, careful preparation must be made; chaotic actions without backup can lead to loss of personal data, photos and contacts; the flashing process, especially in cleanup mode, completely erases the user's memory partition.

You will need a Windows computer (preferably 10 or 11 versions), a working one. USB-cable (preferably original, included) and stable Internet connection, also make sure that the smartphone battery is charged at least 60% so that the device does not turn off at a critical time of data recording.

Make sure to back up your data. You can use the Mi Cloud cloud service, sync with your Google account, or third-party programs like Mi PC Suite. Remember that when you change your firmware region (for example, from China to Global) or choose Clear All mode, all data will be deleted without recovery.

It is also necessary to include the debugging mode on USB And you can also have advanced bootloader settings, even if we don't unlock it right now. → On the phone and press. 7 once-assembly number MIUI/HyperOS, to activate the developer menu. Then to Advanced Settings. → For developers, include the “Debugging by” items USB» and “Facilities release».

Finding and selecting the right version of the firmware

The critical step is finding the right firmware file. Not all file types are suitable for devices with a locked bootloader. You need.zip archives to update through Recovery or.tgz archives (Fastboot), but only to install on top of the same or higher indexed version.

There are several types of firmware: Recovery (update) and Fastboot (full reinstallation). For blocked BL, Recovery firmware of any type (Stable, Beta) is suitable if they are designed for your region. Fastboot firmware can only be used through the Mi Flash Tool, but strictly adheres to the version compatibility rule.

You can't reflash a Chinese firmware (CN) device to a global (Global) or European (EEA) device without unlocking the bootloader. This is a technical limitation associated with different parts of the bootloader and signatures. Trying to make a cross-regional update will result in the error "Can't verify update" or "MiuiVersion check failed."

Download files should only be from trusted sources, such as the official website miui.com or authoritative resources like xiaomifirmwareupdater.com. Pay attention to the device code (for example, gauguin, vayu, davinci), not just the marketing name of the model. firmware from Redmi Note 10 Pro will not stand on the Redmi Note 10, even if they were released in the same year.

Method 1: Update through the built-in Recovery menu

The easiest and safest way to install firmware on Xiaomi with the bootloader locked is to use the regular update menu. This method does not require a connection to the computer and use complex software. MIUI/HyperOS Reinstall the current version if there are errors.

First, download the Recovery ROM archive for your model. Don't unpack it. Place the file in the root of your smartphone's internal memory. Then go to Settings → About your phone and click on the MIUI version. In the window that opens, click three dots in the corner and select "Select a firmware file."

⚠️ Note: If the system says “File failed to check” or “File corrupted”, chances are you are trying to install firmware in another region or an older version.

Once you select the file, the system will check the integrity and ask for a reboot confirmation. Press OK or Reboot. The smartphone will go into Recovery mode, the verification and installation process will begin. The screen can go out and light up, the Mi logo and boot bar will appear. The process can take from 5 to 15 minutes.

Once installed, the device will automatically restart as normal. The first run after firmware can last longer than usual — that's fine, there's an optimization of applications and systems. Make sure you don't interrupt the power of the device in the process, as this can damage system files.

Method 2: Installation with Mi Flash Tool and Fastboot

A more advanced method involves using a computer and the Mi Flash Tool, which allows you to install the system cleanly, fixing deep software errors that the usual update does not remove. However, as mentioned earlier, only the installation mode in the same region is available for a blocked bootloader.

First, download and install the drivers. ADB/Fastboot And the Mi Flash Tool itself. ROM (archive.tgz) and unpack it on your computer into a short-track folder, preferably the root of the C disk, so that there is no Cyrillic on the way: C:\ROM\.

Turn your smartphone into Fastboot mode. Turn off your phone, then press the volume button and connect the cable to your computer. The screen will show an image of a rabbit repairing an android that says FASTBOOT. Open the Mi Flash Tool, press the Refresh button and make sure the device is identified (its serial number will be displayed).

fastboot devices

This command is in the command line (if you use it) ADB-The interface will also confirm the connection. In the Mi Flash Tool window, click "Select" and specify the folder with the unpacked firmware. At the bottom of the window, be sure to select the "Clean All" option. The Clean All and Lock option is only available if you change region, but on an already locked device it can cause an error or bootloop if the region doesn’t match.

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Use it. USB-port 2.0 on the back of the motherboard to connect the smartphone. USB 3.0/3.1 On some motherboards, it may work unstable with Fastboot mode, causing connection timeouts.

Press Flash. You start a firmware process that takes 100 to 300 seconds. You get progress messages in the log. You get success, and you automatically reboot the phone. If you pick Clear All, it's a long first run.

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The main rule of Fastboot on BL is: you can not change the region (CN to Global) and you can not downgrade the Android version.

Solving errors and installation problems

There are a number of bugs that can occur in the firmware process. One of the most common is the "Missmatching image and device." It means you're trying to install a firmware designed for a different model or region. Check the device's code in Fastboot mode (it's written in orange on your phone screen) and compare it to the name of the firmware file.

Another common problem is the "Anti-rollback check failed." This is anti-rollback protection. If you have an ARB4 version on your device and you're trying to put an ARB3, the system will block the installation. Anti-rollback is a security mechanism that prevents you from installing vulnerable versions of the software.

⚠️ Warning: Never force the Anti-rollback protection on a locked bootloader.This is guaranteed to result in hardware locking of the device that cannot be removed software.

If the Mi Flash Tool is giving you a Flash Error error or the process is stuck on a certain percentage, try changing the file. USB-sometimes helps to run a program on behalf of the administrator or use another version of Mi Flash (for example, 2018 or 2020 release year).

If the phone goes into an endless bootloop after firmware, try resetting via Recovery (Wipe Data).If that doesn't help, it may be damaged by the persist or modem partition, which requires contacting a service center for chip soldering or using professional boxing.

Frequently Asked Questions (FAQ)