Checking the status of the Xiaomi bootloader through the command line

For many Xiaomi mobile enthusiasts, deep customization is a top priority. However, the first and most important step in this journey is understanding the current state of the device, in particular, the status of its bootloader. Bootloader controls the process of launching the operating system and prevents the installation of untested software. If you plan to get root rights, install customized recavereators or reflash your smartphone to the global version, you need to know exactly whether this security mechanism is blocked.

There are several ways to know the current state, but the most reliable and technically competent method is to use the command line. The graphical interface can hide details or display information incorrectly after certain manipulations of the system. Using ADB and Fastboot gives direct access to low-level data of the device, eliminating any software errors of the interface. In this article, we will discuss in detail how to perform diagnostics and interpret the results obtained.

Why do I need to check the status of the loader

Understanding whether system partitions are open is critical before any modifications are made: A blocked bootloader will prevent custom recovery such as TWRP from running and will block the installation of modified firmware. Trying to flash a device with a locked Bootloader often leads to an “Update failed” error or, in the worst case, can cause a software failure that requires complex recovery.

In addition, knowing the status is necessary to assess the security of the device when buying from hand.If the seller claims that the phone is unlocked, but the verification shows otherwise, this may indicate an attempt to hide the real characteristics or repair history. Xiaomi has implemented a strict security policy, and the official unlock status should be displayed correctly in the system logs.

The check also helps diagnose boot problems: If the phone goes into an endless reboot or hangs on the logo, the status of the bootloader can tell whether a previous owner failed to modify the system or as a result of an update failure.

⚠️ Warning: Getting device status through the command line is a safe operation that does not result in data loss. However, any further actions to unlock or firmware should only be performed with full battery charge.

Preparation of the working environment and drivers

Before you go into commands, you need to ensure a stable connection between your computer and your smartphone. To work, you need an installed Platform Tools package that contains adb and fastboot utilities. Without these tools, the operating system will not be able to properly process the requests sent to the device in debugging mode.

The critical thing is to install the right drivers. You need ADB Drivers for normal operation, and Fastboot Drivers for bootloader mode. In Windows operating systems, it is often necessary to manually install drivers through Device Manager if the automatic installation does not work. Make sure that there are no unknown devices with yellow exclamation marks in the Device Manager when the phone is connected.

Use only quality USB-It is recommended to connect the smartphone directly to the port on the motherboard, avoiding the use of cheap charging cables that can not transmit data, which will lead to a connection error. USB-hubs that can cause connection instability.

Activation of the developer mode and debugging

In order for the computer to see the smartphone and transmit commands, you need to activate the hidden menu of the developer. Standardly, these settings are hidden from the average user to avoid accidental changes in system parameters. → On the phone and press fast. 7-10 once-field version MIUI (You'll then be notified that you've become a developer.

Then you should turn on the debugging directly. Go to Settings → Advanced Settings → Developer. Find the Debugging USB and activate it. When you first connect to your computer, you will see a request on your smartphone screen to confirm the debugging with an RSA keyprint - be sure to click "Allow", otherwise the commands will not be executed.

In some cases, especially on newer versions of firmware, you may need to activate the status of "Mi Unlock" in the same developer menu, find the Mi Unlock Status item and add your account. This action will link the device to your Xiaomi profile and allow the system to understand that you are the owner of the device.

⚠️ Note: When you include debugging on USB It's standard procedure, but don't leave this feature on permanently unless you're using it right now.

Checking through ADB in a working system

The first stage of diagnostics can be done without taking the phone out of normal operation mode. Connect the smartphone to the PC and open the command line in the tool folder. Enter the command adb devices. If done correctly, you will see the serial number of the device and the status of the device. This confirms that communication is established.

To find out the status of the bootloader, you don't always have to go to Fastboot. You can request information directly through the Android shell.

adb shell getprop ro.boot.flash.locked

The result of the command is digital. If you get 1, the bootloader is locked. If the answer is 0, the access is open. This method is convenient because it does not require rebooting the device. However, it does not work on all models and versions of Android, because some manufacturers hide this parameter in the working system.

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If the command returns an empty string or error, try rebooting the phone to Fastboot mode for more accurate diagnosis.

You can also get more information about the state of the system by entering the command adb shell getprop and analyzing the output, but for a quick check of the lock status of the above method is enough. Remember that ADB only works when the Android system is fully loaded and works correctly.

Diagnostics in Fastboot mode

The most accurate and versatile way to check is to use Fastboot mode. This mode starts before the operating system boots, so it works even on devices with a damaged system or "bootloop." To switch to this mode, turn off the phone and press the Volume Down and Power buttons simultaneously before the Fastboot logo appears.

Connect the device to the computer and enter:

fastboot devices

Now, you need to type a command to get the full information.

fastboot getvar all

In the list of variables, find the row (bootloader) unlocked: yes or (bootloader) unlocked: no. There may also be a secure boot option. If you say yes against unlocked, the bootloader is unlocked. This state allows you to make changes to system partitions. If no is specified, access is closed.

Fastboot mode will also show the current firmware version, serial number, and other technical details, a great way to make sure you plug in exactly the device you planned, especially if you have multiple.

Interpretation of results and possible problems

Once you get the data, it's important to decrypt it correctly. The only official unlock indicator is "Unlocked" when you boot your device or in Fastboot. If you unlock your phone using third-party methods without changing that flag, the system may be unstable, and some apps (banks, Google Pay) may fail.

A common problem is when the computer doesn't see the device in Fastboot mode "QHSUSB_BULK" It's called "Unknown Device." That means there's no driver, so you can install Qualcomm or Xiaomi drivers. USB Drivers. also check if the antivirus or firewall is blocking the connection.

If the fastboot getvar all command is giving out too much information and it's hard to find the right string, you can use filtering. In Windows, this is done through the findstr command:

fastboot getvar all | findstr unlocked

This will only show a line containing the word "unlocked," which makes reading much easier. Linux and macOS use the grep command instead of findstr.

⚠️ Warning: Never attempt to execute a fastboot flashing unlock or oem unlock command via the command line unless you have gone through the official unlock procedure through Xiaomi servers.This will result in a complete device lock or data loss without the ability to recover.

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“Locked” status means the complete integrity of the system, and “Unlocked” means the right to modify, but with a risk to the security of the data.

Frequently Asked Questions (FAQ)