Owning a modern Xiaomi smartphone offers a wide range of customization opportunities, but often comes at the expense of manufacturer-imposed restrictions. A key obstacle for enthusiasts is a locked bootloader that prevents third-party firmware installation or superuser rights from being obtained, and this is where unlock code, the digital key to full control of the device, comes into play.
The process of obtaining this code and the subsequent unlocking may seem difficult for a beginner, but with the right approach, the procedure takes no more than 15 minutes. It is important to understand that unlocking the bootloader is not just a technical formality, but an action that changes the status of warranty and data security. Before you start active actions, you need to weigh all the risks and prepare the device properly.
In this guide, we will take a look at what Mi Unlock is, how to properly link an account to a device, and what to do if the company’s servers don’t issue code immediately, learn about the intricacies of working with ADB and Fastboot, and how to avoid common mistakes that can turn a smartphone into a “brick”.
What is Unlock Code and Why is it Necessary?
Unlock code, or unlock code, is a special token that verifies your right to change the system partitions of a smartphone. In the Xiaomi ecosystem, this mechanism is implemented through the device's binding to the Mi Account. Without passing this procedure, the bootloader downloads any images of the system, except for official, signed digital keys of the manufacturer.
The main purpose of this code is to protect user data and prevent device theft, and if an attacker steals a phone, they can't just reflash it and sell it because it requires access to your account, but for developers and advanced users, this limitation becomes a barrier to install custom recoveries like TWRP or gain Root rights.
⚠️ Note: The process of unlocking the bootloader automatically performs a full data reset (Wipe Data). All photos, contacts and applications will be deleted without the possibility of recovery, so creating a backup is a must.
It’s worth noting that having an unlock code doesn’t mean instant access to all features. There are models where even after unlocking, you can have problems with your camera or banking apps. Xiaomi’s security algorithm is constantly updated, and what worked on the Mi 10 may be different from the procedure on the Redmi Note 12.
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Use the main one. SIM-Mi Account registration card, as linking the phone number is a prerequisite for obtaining the unlock code.
Preparation of the device and account Mi
The first and most important step is to properly configure the smartphone itself before connecting to the computer. You need to log into your Mi Account through the settings menu, not just through the app store, and this is the authorization that will be checked by the server when you request to unlock.
After you log in, activate the developer mode. Go to Settings → About Phone and click 7 times in a row on the MIUI (or HyperOS) field. After the message "You became a developer", a new menu will open in the "Additional" section.
- 📱 Enable the option "Factory Unlocking" (OEM unlocking in the menu for developers.
- 🔗 Click on Mi Unlock Status and link your account to your device (mobile internet required, Wi-Fi may not work).
- 🔒 Make sure the device has a screen unlock password installed (PIN-code).
- 📶 Use the mobile network 4G/5G for final binding confirmation by turning off Wi-Fi at the time of check.
It is important to understand that there is a certain amount of time between the time you link your account and the time you actually unlock it, which usually takes between 168 hours (7 days) and 360 hours (15 days) depending on the region and activity of the acca!unt. Trying to unlock the device before that time will result in an error.
Installation of drivers and Mi Unlock Tool
To interact with your smartphone in deep diagnostic mode, you will need specialized software on your computer, the main tool is the Mi Unlock Tool, which is officially distributed by Xiaomi, and you should download it only from the official website to avoid the introduction of malware.
Beyond the program itself, the right drivers are critical. Windows often automatically installs standard ADB drivers that are not suitable for Fastboot mode. You need to install the full Xiaomi USB Drivers package. If you see "Android" or "Unknown Device" in the Device Manager when you connect your smartphone in Fastboot mode, then the drivers are installed incorrectly.
The driver installation process is best done manually through Device Manager. Select the device with the exclamation mark, click "Update driver" → "Select from the list of available drivers" and specify the path to the folder with the Xiaomi drivers. Make sure that the Android Bootloader Interface device appears in the list.
Check the connection in the command line:
fastboot devices
// The serial number of the device must be displayed⚠️ Note: Use the original USB-cable and connect it directly to the port on the motherboard (back of the system unit), avoiding USB-hubs and front ports that can provide unstable power.
☑️ Verification of PC readiness
Receiving and entering the unlock code
The process of obtaining unlock code occurs automatically in the background through the Mi Unlock application. After you successfully tied the device and waited for the due time (for example, 7 days), you need to start the utility again on your PC and log in to the same account that was used on your smartphone.
Transfer the phone to Fastboot mode (phone turned off, clamp Volume Down) + Power. Connect the cable to your PC. In Mi Unlock, press the "Unlock" button. The system will contact the server, check the anchor status and latency. If all the conditions are met, the server will issue permission, and the unlocking process will begin.
In some rare cases, especially on global firmware versions or newer models, manual verification via SMS to the linked phone number may be required.The program will issue a window asking you to confirm the action. Enter the code from the SMS into the appropriate field.
| Status at Mi Unlock | Meaning | User actions |
|---|---|---|
| Couldn't verify device | Account is unrelated or little time has passed | Check the binding in the settings of the phone, wait 168 hours |
| Please unlock 168 hours later | Waiting for the timer to expire | Do not re-link the account, just wait for the end of the term |
| Unlocking... 99% | Data erasure is under way | Do not turn off the cable, do not press buttons, wait for the reboot |
| Unlocked successfully | Unlocking complete | You can install custom recavers or firmware |
Successful completion of the process will be marked by a device reboot. The first start after unlocking can take longer than usual, as the system will reassemble the cache and check the integrity of the partitions. On the boot screen, a warning may appear that the device is unlocked - this is normal.
Why can the timer reset?
Typical errors and methods of their solution
Even with all the instructions, users often encounter technical problems. One of the most common errors is the Error 10009 or the message that “the account is not connected to the device.” This often happens if you logged in to Mi Unlock on a PC under one account and the phone is linked to another, or if not enough time has passed since the connection.
Another common problem is the process hanging on 99%. It doesn't mean that something went wrong. At that point, there's a physical re-marking of the memory partitions and deletion of the encryption keys. Interrupting the process at that point is guaranteed to lead to a Hard Brick. 10-15 Try to reconnect the cable, but do not interrupt the power supply forcibly.
- 🚫 “Current account is different” error: You try to unlock your phone with a different account than the one tied to Mi Unlock status.
- 🌐 Network error: Xiaomi servers are often not available from regions. DNS (for example 8.8.8.8.8.8.8) or replace IP-address.
- 🔌 The problem with the port: Change USB-port or cable if the device is permanently disconnected during the.
If Mi Unlock is constantly producing errors related to the Android or MIUI version, try updating the firmware to the latest stable version via the update menu, and then repeat the binding procedure. Sometimes cleaning the Security and Mi Unlock app data on the smartphone itself helps before re-binding.
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90% of unblocking errors are due to non-compliance with the wait timer (7 days) or using different Mi accounts on your PC and smartphone.
Consequences of Unblocking and Safety
Getting the unlock code gives you complete freedom of action, but it also removes a number of security mechanisms from the device, primarily data security. With the bootloader unlocked, an attacker, having physical access to the phone, theoretically can install malicious firmware.
In addition, many applications that use SafetyNet technology or its analogue Play Integrity API, Banking apps, Google Pay (Wallet), Netflix in HD-quality — they all require a locked bootloader to run, and you can get around this with Magisk modules, but it requires more knowledge.
Officially, Xiaomi says unlocking the bootloader does not deprive the hardware of its warranty, but in the event of a breakdown that can be associated with software interference (such as a processor burning due to overclocking), the service center may refuse free repairs. Always weigh the need to unlock.
⚠️ Warning: Once the bootloader is unlocked, the Find Device and remote lock may not work stable or be disabled, increasing the risk of data loss when theft occurs.
For most regular users who just want to use a phone, unlocking is not necessary. It's for developers, testers and enthusiasts who understand the risks. If your goal is just to speed up the phone, you'd better start by cleaning the cache or resetting the settings without having to do complicated bootloader manipulation.