How to check if Xiaomi bootloader is blocked

Modern Xiaomi, Redmi and POCO smartphones come with a closed bootloader by default, a standard security measure designed to protect the device from malicious code and unauthorized modification of system files. However, for enthusiasts who want to get Root rights, install custom firmware or use specialized software, this barrier becomes an obstacle. Understanding the current status of the bootloader is the first and critical step before starting any manipulation of the software.

The verification procedure may seem complicated to a beginner, but in fact there are several reliable ways to verify the status of BL. A blocked bootloader will not allow you to flash a modified Recovery or obtain superuser rights, whereas an unlocked one gives you complete freedom of action. It is important not to confuse statuses, since trying to write data to a locked partition can lead to a brick of the device.

In this article, we will take a look at all diagnostic methods, from simple visual inspection during boot to the use of professional snails like the Mi Flash Tool. You will learn to distinguish between Locked and Unlocked states, and understand the risks of unlocking. Remember that interfering with system partitions always requires caution and understanding the consequences.

What is a bootloader and why it is important for Xiaomi

Bootloader is a special program that starts immediately after the device is turned on, even before the Android operating system boots. Its main task is to initialize the hardware and launch the OS kernel. Xiaomi smartphones use MIUI Bootloader, which has two states: locked and unlocked. In the locked state, it checks the digital signature of all downloaded components.

If the signature doesn't match the reference (as with custom firmware or modified Recovery), the bootloader will refuse to start the system. It's a security mechanism that guarantees the integrity of the software environment. Unlocking removes that check, allowing any code to be downloaded, but at the same time reduces the security of the device.

Users often confuse the concepts, believing that unlocking the bootloader automatically gives the Root-right. It is not. Unlocking BL only opens the door to install a modified bootloader or kernel that will already grant the rights of the superuser. Without an unlocked bootloader, installing TWRP or Magisk is technically impossible.

Visual status check when loading the device

The easiest and fastest way to know bootloader status is to pay attention to the screen while you turn on your smartphone. When you put your device into Fastboot mode, a distinctive image appears on the screen with an Android logo and a rabbit fixing the robot. At the bottom of the screen, technical information is displayed, including the status of the Bootloader.

If you see the word "Locked," it means that the bootloader is locked in factory settings, which is standard for 99% of Xiaomi devices purchased at retail, and the word "Unlocked" (often highlighted in orange) indicates that the device has already been officially unlocked through the Mi Unlock service.

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To enter Fastboot mode, press the volume down button and the power button on the smartphone turned off at the same time. Hold them until the Mi logo and the image of the hare appear.

It is worth noting that on some new models with a HyperOS shell or an updated one. MIUI The visual display may vary, and in rare cases, the inscription may be hidden or replaced. QR-In such a situation, you should not rely only on visual inspection, and it is better to use software methods of checking through a PC.

⚠️ Warning: If the orange text "Unlocked" is on the screen, it means that data protection is reduced.

Using the Mi Flash Tool for Accurate Diagnostics

The official Mi Flash Tool, designed to run smartphones, is one of the most reliable tools for checking status. When you connect your device in Fastboot mode to your computer, the program reads information directly from the phone's memory. The main utility window, in the "Device" column, displays the serial number, and in the "Status" column, the current state of the bootloader.

Locked status confirms factory lock, Unlocked status indicates open system, and the advantage of this method is that it works even when the visual display on the smartphone screen is unreadable or corrupted. ADB-Fastboot drivers and protocol at a low level, providing reliable data.

To work, the method requires installing Xiaomi and Qualcomm drivers (or MediaTek, depending on the platform) on the computer. Without properly installed drivers, the computer will not be able to identify the device in bootloader mode, and the program will show a blank list of devices. This is a common problem on Windows 10 and Windows 11 operating systems without signed drivers.

⚠️ Warning: Before connecting your phone to the Mi Flash Tool, make sure the battery is at least 50% charged.Stop reading the information due to the discharge can cause the device to freeze in Download mode.

Checking through command line and Fastboot

For users who prefer to work with the command line, there is a direct request to the device. This method does not require the installation of heavy graphics shells. You will need a folder with a minimum set of ADB and Fastboot. After connecting your smartphone in Fastboot mode, open the command prompt (cmd) in the utilities folder and enter a command to survey the device.

fastboot getvar all

This command will display a large list of loader environment variables. Find the row (bootloader) unlocked: no or (bootloader) unlocked: yes. The value of "no" corresponds to the locked state, "yes" - unlocked. You can also use the shortened command fastboot oem device-info, which immediately shows the lock status in a more readable format.

Sometimes the response from the bootloader may be hidden or require authorization if some security flags have been changed before. In such cases, the full output of getvar all must still contain the desired variable. If the device does not respond to Fastboot commands, check the integrity USB-Try another port, preferably a cable. USB 2.0.

Analysis through ADB teams in a working system

If you have access to a working operating system and USB debugging is enabled, you can get information about the bootloader without rebooting to Fastboot. To do this, you type in the command line of the PC adb reboot bootloader to go into the desired mode, or use a command to obtain system properties.

However, a more informative way is to query properties through a working ADB shell.

adb shell getprop ro.boot.flash.locked

The result "1" means that the bootloader is locked. The result "0" is unlocked. This method is convenient because it allows you to script a check or get a response quickly if the phone is connected to debugging applications. It is worth remembering that on some versions of MIUI, access to these properties may be limited to conventional applications, but through ADB with shell rights, access is usually open.

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The value of "ro.boot.flash.locked = 1" is the most accurate software indicator of the blocked state of the bootloader in the Android environment.

You can also check for root rights, which often (but not always) accompany the unlocked bootloader, with the adb shell su command. If the device responds with access to the superuser, this is an indirect sign of a system modification, although it is theoretically possible to have an unlocked BL without Root and vice versa (on very old devices).

Comparative table of verification methods

To organize what we've learned, we'll look at the basic methods of comparison, and each has its own advantages depending on the situation: whether you have access to a PC, whether your phone is on, whether your software is installed.

As you can see from the table, a quick visual inspection is enough, and for documentary evidence or for complex operations, you should use the Mi Flash Tool or command line, and the choice of method depends on your current conditions and the equipment available.

Possible problems and solutions

Users may encounter difficulties in checking. The computer may not see the device in Fastboot mode. Often the problem is that there are no Android Bootloader Interface drivers. Device Manager will have a yellow exclamation point for the device, and the solution is to install drivers from Mi Unlock or Mi Flash.

Another common problem is the command line message, "Waiting for device," which means that the command is sent, but there is no answer. Check the cable: some cables only support charging and do not transmit data. Use the original Xiaomi cable or a quality, supported analogue.

⚠️ Warning: If the bootloader is unlocked and the Mi logo is on fire, this may indicate damage to the system partitions, in which case you will need a complete flashing through the Fastboot with data cleaning.

It is also worth considering that on devices with MediaTek processors (some Redmi Note models), the procedure may differ from devices on Snapdragon. MediaTek sometimes requires the use of specific utilities like the SP Flash Tool, although the bootloader status there is also often displayed in Fastboot (or BootROM mode).

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