Xiaomi device owners who plan to get advanced access rights or install custom firmware inevitably face the need to unlock the bootloader. However, before any manipulations begin, it is critical to understand the current state of security of your gadget. The bootloader status determines whether the device is locked by the manufacturer or is ready for modifications. Many users make the mistake of starting complex procedures without preliminary diagnosis, which can lead to unpredictable results.
Fastboot mode is a low-level device interface protocol that allows you to send commands directly to your smartphone memory, bypassing the operating system. This is where key information is stored about whether you allow firmware to be reflashed. Unlike normal mode, Fastboot shows the truth by ignoring software locks that can be installed on Android. Verifying this parameter is the first and most important step before any software intervention.
In this article, we will discuss in detail the process of putting your smartphone into diagnostic mode, installing the necessary drivers and interpreting the data obtained. You will learn to distinguish between locked and unlocked states, and also understand what to do if the system displays unexpected codes. A competent assessment of the situation will save you hours of troubleshooting and save you from potential problems with the "bricking" of the device.
Preparation of working environment and tools
Before you connect a USB cable to your computer, you need to make sure that the software is working correctly. The main tool for interacting with Fastboot mode is the ADB package and Fastboot Tools from Google. Without these tools, the computer simply cannot “see” the smartphone in diagnostic mode, displaying only an unknown device in the task manager.
The second critical component is drivers. Xiaomi devices often require specific drivers other than standard Windows Android drivers. If you see an exclamation mark next to the Android Bootloader Interface in the Device Manager, the drivers are installed incorrectly or not at all. The driver installation must be done before the phone is connected in Fastboot mode, so that the system automatically recognizes the equipment.
☑️ Verification of PC readiness
It is also important to take care of integrity. USB-Cheap cables designed only for charging do not transmit data, making it impossible to execute a status check command. USB 2.0 or 3.0, located directly on the motherboard, avoiding the front panels of the case or USB-Hubs that can give unstable food.
Translation of Xiaomi smartphone in Fastboot mode
The process of entering diagnostic mode on Xiaomi and Redmi devices is standardized, but requires precision. First, turn off your smartphone completely. Make sure the device is not in hibernation mode, namely, turned off. Then press the Volume Down and the power button simultaneously.
Hold both buttons until a characteristic image of a hare repairing an android appears, or a label. FASTBOOT You can release the buttons at this point, and if the screen is still black, try connecting the device to the computer through a computer. USB-Cable by holding the volume button. Some Android 12 and higher models may require Fastboot sign-in confirmation by tapping the screen.
⚠️ Note: If the phone vibrates when you try to log in to Fastboot and immediately restarts in normal mode, it may be that the volume button is physically faulty or stuck.
Once you're successful, connect your smartphone to your PC. The Fastboot logo usually shows up on your phone screen with an image of an android. The computer has to make a sound of the new device being connected. If that doesn't happen, check the cable or try another one. USB-Only when you've made sure that you're connected to a stable connection can you move on to sending status requests.
Requesting information via the command line
To get the status of the bootloader, we will use console commands. Open the command line (cmd) or PowerShell in the folder where the fastboot.exe files are located. Alternatively, you can open the terminal in any folder if the paths to the system tools are written in Windows variables.
The first command to check the connection is fastboot devices, which must display the serial number of your device. If the list is empty, the drivers are not working or the cable is not transmitting data. Make sure that the Device Manager in the "Android Devices" or "Ports" section is free of errors.
fastboot devicesOnce the link is confirmed, you enter the main command to check the status: fastboot getvar all or more specifically fastboot getvar unlocked. The first command gives out a huge array of technical information about all the loader variables, the second command only the parameter we are interested in.
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If the fastboot command is not recognized, try adding the.exe extension by writing fastboot.exe getvar all. This often helps if the paths in the system are not configured correctly.
Transcription of the audit results
When you get a response from the device, you'll see a status string. The most common option for a new phone is (unlocked: no) or Device state: locked. This means that the bootloader is locked by the manufacturer, and the signature of the system partitions is checked every time you boot. Trying to flash a modified recovery or bolognader without officially unlocking in this state will lead to an error.
If you see (unlocked: yes) or Device state: unlocked, the bootloader is unlocked, and when you turn on, the phone will display a warning that the device may not be secure, and you can install customized recaps like TWRP and modify system files.
There is also an intermediate or specific status associated with regional features, such as global firmware versions that may have different flags compared to Chinese ones, and below is a table of the main variable values that can be found when running getvar all.
| Variable | Meaning | Description |
|---|---|---|
| unlocked | yes / no | The main flag of unlocking the loader |
| device | codename | Device code name (e.g. guacamole) |
| serialno | number | Unique serial number of the device |
| version-bootloader | version | Current version of the bootloader |
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The key parameter is the line "(unlocked:.....) If there is a "no" there, any attempts to firmware custom images without first officially unlocking through Mi Unlock will cause a failure.
Analysis of error codes and special states
Sometimes, instead of a clear answer, the system will produce errors or non-standard codes, such as the FAILED message: remote: device is locked when you try to execute write commands indicates active protection, which is a normal reaction on a locked device when you try to change data, but not when you request status.
Special attention should be paid to devices with MediaTek processors, which have begun to be actively used in low-end Redmi models, for which standard Fastboot commands may work differently or require a transition to BROM mode for deep diagnostics. In such cases, the standard getvar command may not return the expected result, requiring the use of specialized utilities.
⚠️ Note: If you receive multiple lines with an error in response to a command "FAILED", But the unlocked status is displayed correctly -- ignore the bugs. Some variables may be hidden or unreadable in the current state of the software.
There is also a situation where the status shows unlocked: yes, but the phone behaves as locked (does not load with custom recovery).This may indicate the presence of additional signature checks in a specific region or version of MIUI. In such cases, an analysis of download logs via fastboot oem log is required.
Frequent problems and methods of their solution
One of the most common problems is that the PC doesn't react to the connection. If the Device Manager doesn't show changes, try replacing it. USB-Cheap cables often don’t have data lines, and it’s also worth checking if the Android Bootloader Interface driver is manually installed through Device Manager if the automatic installation doesn’t work.
Another problem is cyclical reboot when connected, which can be a sign of deep battery drain or driver conflict, try to press the power button for 15-20 seconds to force reboot, then re-enter the Fastboot, make sure that the battery is at least 20-30%.
If the fastboot device command returns the device number but getvar issues a timeout, it may be that the antivirus is blocking the connection or the USB port is unstable. Try disabling the antivirus while you diagnose and using the USB 2.0 port.
What to do if the status is not read?
Data security when working with the loader
It is important to understand that the process of status verification via the getvar command is secure and does not result in data loss. This is a read-only operation. However, if you decide to change the status of the bootloader, all data on the device will be permanently deleted for security reasons.
Unlocking the bootloader resets the encryption keys, so without full wiping, access to user data will be impossible, which is why you need to make a full backup of important information to an external medium or to the cloud before any actions following status verification.
In addition, on an unlocked bootloader, some banking applications and services (Google Pay, Mir Pay) may stop working or require additional manipulation to hide root rights. Status check helps to assess the risks and the need to use such applications in everyday life.