How to block the bootloader on Xiaomi: the complete guide

Owners of Xiaomi, Redmi and POCO smartphones often face the need to unlock the bootloader to install custom firmware or obtain superuser rights. However, once these actions are done, the system loses some of its integrity, and banking applications and Google Pay services cease to function correctly. A reasonable question arises: can everything be returned to its original state without flashing the device?

Locking the bootloader on Xiaomi is a procedure that returns the device to the status of an official gadget. This action is critical for those who want to sell the phone, since the presence of an unlocked BL significantly reduces the market value of the device.

It is worth noting that the process does not always go smoothly and requires strict adherence to algorithms. Wrong actions can lead to the fact that the smartphone turns into a “brick.” In this article, we will examine all the nuances, tools and pitfalls associated with the restoration of factory lock bootloader on the devices of the brand.

Why block the loader back?

Many users forget the importance of the integrity of the software environment until they face limitations: a locked bootloader ensures that only signed system images are loaded onto the device, a fundamental security element of the Android ecosystem that prevents low-level malware from being introduced.

If you are planning to sell your Xiaomi, buyers will definitely check the status of BL. An unlocked bootloader is often associated with risks: the previous owner could install spyware or change system files.

In addition, some security features, such as Secure Folder or Mi Account anti-theft protection, may not work properly or be completely disabled when accessing the bootloader is open. Banking applications also use SafetyNet/Play Integrity mechanisms, which often “fall” when unlocked.

• 🔒 Improving the security of personal data and banking applications
• 📈 Increased liquidity of the smartphone during resale
• 🛡️ Restoration of the functions of protection against theft and encryption
• ✅ Correct work DRM-content (Netflix) HD, Disney+)

⚠️ Attention: Locking the bootloader on an already modified device (with root rights or custom recovery) can lead to an endless restart cycle (bootloop).

Risks and consequences of the procedure

Before you start taking action, you have to understand all the risks, and the biggest danger is data loss, because when you lock the bootloader, the system compulsively resets the full Wipe Data, similar to the factory reset, but at a deeper level, if you don't back up, you can't restore photos and contacts.

The second major risk is the incompatibility of the current firmware: If the phone has a global version of the software installed and you try to block a bootloader that is waiting for Chinese firmware (or vice versa), the device may stop loading. Xiaomi’s regional restrictions strictly monitor the compliance of the device region and the firmware region.

There is also a risk of hardware problems if the process is interrupted. Although modern Xiaomi equipment is quite stable, a power surge or a cable shutdown at a critical moment can disrupt the loading of system partitions, in the worst case you will have to use paid services to unlock through the server.

Preparation of a smartphone and a computer

The success of the operation depends on 90% quality training. You will need a computer running Windows, as drivers and utilities from Xiaomi are optimized for this OS. Make sure that the hard drive has enough free space and installed a stable antivirus that will not block the work of system tools.

The smartphone must be charged at least 60 percent. The process can take time, and suddenly turning off the device is unacceptable. You also need to check the Android version and build number. If you installed custom recavators (for example, TWRP), it should be removed or replaced with stock Recovery.

For the work you will need an original USB-cable USB-port, preferably connected directly to the motherboard, and not through the front panel of the case or USB-Unstable connection is a common cause of errors when exchanging keys with the server.

Required tools and drivers

The main tool for working with the bootloader is the official Mi Unlock Tool. Despite the fact that it is used for unlocking, it is through it that the status check and the lock command is performed, you should download the program only from the official website miui.com/unlock to avoid modified versions with malicious code.

In addition, the computer must have universal ADB and Fastboot drivers installed. Without them, the computer will not be able to correctly recognize the device in bootloader mode. Often Windows 10 and 11 automatically find drivers, but for Xiaomi it is better to use the specialized Xiaomi USB Drivers package.

The table below shows the main components required for successful completion of the procedure:

⚠️ Note: Using modified versions of Mi Unlock (so-called "patched" versions) to bypass the 168-hour wait may result in a Mi Account being blocked.

Step-by-step instructions for blocking

The locking process requires careful attention. First, make sure that the phone has an official stock firmware installed. If you have custom build (LineageOS, Pixel Experience, etc.), it must be removed and the original MIUI or HyperOS returned. Only then you can proceed to action.

Run the Mi Unlock utility on your computer and log in to your Mi Account. Connect your smartphone in Fastboot mode (press the volume button when the phone is turned off and connect the cable).

In the program interface, click the Lock button (usually next to the Unlock button). The system will issue a warning that all data will be deleted. Confirm action. The phone will restart, start cleaning and locking. This can take 5 to 15 minutes.

fastboot oem lock

In some cases, if the utility does not respond, you can use the command via the ADB console, as shown above. However, the GUI is more reliable, since it conducts additional server checks.

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If your phone goes to bootloop after locking, try Recovery (Power + Vol Up) and make Wipe Data, then Wipe All Data.

Possible mistakes and ways to solve them

One of the most common errors is the message "Couldn't verify device." This means that the Mi Account associated with the device is not the same as the one authorized in Mi Unlock. The solution is one: reset the account in the phone settings ("Developers -> Mi Unlock Status") and try again.

Another common problem is the error "Current account is different from the account info on the device." This happens if you change your password or login after the last sync, you need to log out of Mi Account on your phone, clear the "Mi Account" service in the application settings, log in again and then try to block.

If the phone doesn’t turn on after locking and only the Mi logo burns, you may have blocked the bootloader on a modified system, in which case only flashing through Emergency Download (EDL) mode will help, which often requires an authorized service center account.

• ❌ Authorization error: recheck the username / password Mi Account
• ❌ Network Error: Check your Internet connection on PC
• ❌ Bootloop: need to reflash stock image
• ❌ Drivers: Reinstall them in Device Manager

⚠️ Note: If you have Magisk or other modifications to the system partition installed, locking the bootloader without first returning to the drain is guaranteed to cause the system to fail.

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The bootloader lock is only possible on the fully stock firmware with the original Recovery.Any modifications must be removed before the procedure begins.

FAQ: Frequently Asked Questions