Modern Xiaomi, Redmi and POCO smartphones offer users excellent performance and functionality, but the standard MIUI or HyperOS shell imposes a number of restrictions on deep configuration. To gain full control of the device, install custom firmware like LineageOS or obtain superuser rights, you need to unlock the bootloader, which opens access to the system partition, allowing you to modify the kernel and make changes that are not available in the drain state.
It is important to understand that unlocking Bootloader is not just a switch in the settings, but a complex procedure that requires preliminary preparation and waiting. Xiaomi has implemented a multi-level security system that includes binding to the Mi Account account and a mandatory wait for 168 hours (7 days).
Before taking action, we need to understand the consequences: once successfully unlocked, all data on the device will be permanently deleted for security reasons. In addition, some high-security banking applications and services may stop working properly, although modern bypassing methods minimize these risks. Unlocking the bootloader will automatically void the manufacturer's warranty in most regions.
Impact of Unblocking and Risk Assessment
The bootloader access procedure changes the security status of your gadget dramatically. In normal mode, Bootloader checks the digital signature of each downloaded system component, ensuring that the code has not been changed by third parties. Once unlocked, this check is disabled or put into alert mode, which theoretically allows attackers to introduce malicious code at a deep level if the device falls into the wrong hands.
High-resolution codecs such as the Widevine L1, which provide HD and 4K content playback on streaming platforms, can degrade to L1 or even L3 levels, meaning that Netflix or Amazon Prime Video can limit picture quality to standard 480p or 540p resolution, even if the smartphone screen supports 2K.
⚠️ Warning: After unlocking the bootloader, the “Find My Device” function may not work correctly or be completely disabled, which will complicate the search for a smartphone in the event of its loss.
Also worth considering is the impact of communication modules. In some cases, especially when installing custom cores or modified firmware, there may be problems with defining 4G/5G networks or reducing data speeds. However, if you plan to stay on official firmware and just get root rights, these risks are minimal, but they exist.
- 🔒 Completely delete all user data when you first download after unlocking.
- 📉 Possible loss of Widevine certificate L1 and reduced streaming quality.
- 🛡️ Reduced overall device security and potential vulnerabilities.
- ⚠️ Cancellation of the official guarantee by the manufacturer or seller.
Preparation of the device and account Mi
The foundation of a successful operation is the proper preparation of the account.You will need an active Mi Account that must have been registered at least 30 days ago in some regions, although often the requirement is mitigated until the time of binding.This is the account that your device’s IMEI will be tied to, and Xiaomi servers will check compliance when trying to unlock.
On the smartphone, you need to activate the developer mode. To do this, go to the Settings → About the phone and start quickly clicking on the MIUI Version (or OS Version) bar before the message “You became a developer” appears. Then a new option will appear in the expanded settings menu “Additional” or “Extended settings”, where you need to find “Developers”.
In the menu for developers it is critically important to include two parameters: “Debugging by the USB» and "Mi Unlock status"; when activated, the system will require insertion SIM-maps and Wi-Fi or mobile Internet connections, and once you turn on these options, the device will be linked to your account, and the waiting time will start counting down.
☑️ Checklist of preparations
Remember to back up your data completely, as the process is irreversible without losing information. Use the built-in Mi Cloud app or third-party solutions to save contacts, photos and settings. Also make sure that the battery is at least 60% so that the device does not turn off at a critical moment.
Installation of drivers and tools on PC
To interact with a smartphone in bootloader mode, the computer needs specific drivers that are not always installed automatically through standard Windows tools. The main tool is the Mi Unlock Tool utility, which should be downloaded exclusively from the official website miui.com/unlock. Using modified versions of the program can lead to account lock or data leakage.
The process of installing drivers often causes difficulties for beginners. When connecting a smartphone in normal mode, ADB drivers work, but to unlock you need Qualcomm or MediaTek drivers in Fastboot mode. It is recommended to install the full Android SDK Platform Tools and Google USB Driver drivers, as well as specific drivers from Xiaomi, if they are available as part of the Mi Unlock installer.
adb devices
fastboot devicesAfter installing all the necessary software and restarting your computer, connect your smartphone with a cable. Check the display of the device in Windows Device Manager. Under "Android Devices" or "Ports (COM and LPT)» There shall be no unknown devices with yellow exclamation marks, if the device is defined as «QHSUSB_BULK» or “MediaTek PreLoader”, which means that the drivers are installed correctly for the firmware mode.
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Use the original. USB-cable and connect it directly to the motherboard port on the back of the PC, avoiding USB-hubs and front hull ports to avoid communication breaks.
Step-by-step instructions for unlocking
When the 168 hours of waiting have expired since the device was linked to the account, you can start the final stage: start the Mi Unlock Tool program on your computer and log in using the same Mi Account as on your smartphone, the program will check the status of the account and confirm the presence of the associated device.
Put your smartphone in Fastboot mode. Turn the device off completely, then press the volume and power buttons at the same time. Hold them until the image of a hare repairing an android appears on the screen or the words FASTBOOT. Connect the phone to your computer with a cable.
In the Mi Unlock Tool window, press the "Unlock" button. The system will issue a warning that all data will be deleted. Confirm the action. The process will take from a few seconds to several minutes. At this time, the progress bar will be displayed on the smartphone screen. Do not interrupt the connection and do not touch the device.
| Phase | User action | Status of indicator |
|---|---|---|
| 1 | Authorization in Mi Unlock Tool | Green check "Connected" |
| 2 | Checking the binding status | Message "Account is bound" |
| 3 | Starting the Unlocking Process | Progress bar 0-100% |
| 4 | Completion and reset | Message "Unlocked successfully" |
Once successfully completed, the phone will automatically restart.The first boot may last longer than usual (5-10 minutes), as the system will reassemble the cache and check the integrity of the partitions. A warning may appear on the screen that the bootloader is unlocked, which can be missed by a long press of the power button.
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Successful unlocking is confirmed by a message in the program and the absence of a password request when booting the system, but the warning on the Bootloader screen will remain forever.
Solving Typical Errors and Problems
The most common problem is the error "Couldn't verify device. This account doesn't have permission to unlock this device." This means that either 7 days have passed or you are trying to unlock a device that is linked to another account.
Another common error is “Unlock failed. Try to relock after 7 days.” This occurs when a user has tried to unlock a device before, the process has been interrupted, and the security system has temporarily blocked, in which case you will have to wait a specified time (usually 7 or 360 days) before trying again.
⚠️ Warning: If the program is 99 percent dead and doesn't make it to the final, don't rush to close the window. Sometimes it takes up to 10 minutes. If there's no change after 15 minutes, check the cable and port. USB.
Device didn’t get detected is often solved by replacement. USB-It can also help to disable the antivirus or firewall, which can block the connection of the program to Xiaomi servers.NET Framework.
Hidden codes for diagnosis
Actions after unlocking: Root and custom recavery
Once you open the bootloader, you have the opportunity to do a lot of modification, and the first step is usually to install a custom Recovery, like this, TWRP (Team Win Recovery Project. This allows you to install firmware, make full partition backups and clear cache. Installation is done via Fastboot by the fastboot flash recovery command. twrp.img.
The most common way to obtain superuser rights (Root) is to use the Magisk highway. APK-Magisk file, rename it to ZIP (or use the installation function in the application, and flash through TWRP Or through patching boot images, which gives you full control of the file system and allows you to delete system applications.
- 📲 Magisk installation for root rights and modules management.
- 🔄 Custom-based firmware ROM (Pixel Experience, LineageOS, Evolution X).
- 🧹 Complete cleaning of the system from advertising and telemetry.
- ⚙️ Overclocking the processor or changing the parameters of energy saving.
However, once you have these capabilities, remember to balance functionality and stability. Excessive modules or an incorrectly configured core can lead to rapid battery discharge or overheating.Always back up EFS and Persist partitions before any manipulation, as their loss can lead to the inoperability of IMEI and sensors.