Owners of popular smartphones like the Xiaomi Mi 8 often face a chilling message on the lock screen that reads "This device is locked." This sign indicates that the device is locked with a Mi Account account after being completely reset or flashed. Android security system integrated with the MIUI shell activates theft protection, requiring the owner to authorize the wearer to continue using the gadget. Without entering the correct data, the phone turns into a useless piece of plastic and glass, preventing even entering the menu.
There are several reasons for this, from a banal forgotten password to buying a device from hand that was not untied from the previous owner’s account. It is important to understand that the error “This Device Is Locked” is hardware tied to Xiaomi servers, so simply flashing through Fastboot without first unlocking the bootloader will not solve the problem.
In this article, we will discuss all possible scenarios, from legal ways to restore access to the technical details of the service centers, you will learn why the security system worked right now and what tools may be needed to reanimate your Xiaomi Mi 8.
The nature of the Mi Account lock and the protection mechanism
The security mechanism that causes the "This device is locked" to appear is part of the Find Device security ecosystem, which is activated automatically when you first log in to a Mi Account on a device, and its primary goal is to render a stolen phone useless to an attacker, even if they try to reflash the device or reset it to factory settings via Recovery Mode.
When you see a password requirement, it means that the company's servers have retained the serial number (IMEI) of your Xiaomi Mi 8 to a specific username. The system does not allow you to bypass this screen with standard Android methods, since the verification is at the bootloader level and is verified remotely. This is not just a software bug, but an intentional feature implemented to protect user data.
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If you have bought a used phone and are blocked, contact the seller immediately.Anyone else's account can only be deleted remotely by the owner through the i.mi.com website.
It's worth noting that there's a difference between locking a bootloader and locking an account: the first one prevents custom firmware installation, the second one blocks access to the system completely, and in the case of This Device Is Locked, it's about linking to an account, which is a more serious restriction that requires authorization.
First scenario: you are the owner of the device.
If your smartphone belongs to you and you just forgot your account password, the situation is resolved in the simplest and most legal way: You need to restore access to your Mi Account. To do this, use any other device with Internet access by going to the official Xiaomi account management site.
The recovery process usually involves a confirmation via a linked phone number or backup email. After a successful password change, the server information is updated and the new password starts to act to unlock the Xiaomi Mi 8. It is important to wait for sync, which can take from 15 minutes to 24 hours, before entering new data on the locked screen.
☑️ Restoring access to the account
In some cases, if the phone number is no longer available, the security system may request answers to classified questions or checks through alternative mail. Security is a priority, so the process can be lengthy. If automatic recovery does not help, the only option is to contact support with a receipt for the purchase.
Scenario Two: Buying a used device or not having a check
The situation is much more complicated if you bought Xiaomi Mi 8 handheld and the previous owner did not untie the device from his account, in which case you will not be able to log in because you do not know the password.
The only legal solution is to find a seller, and if the contact with the seller is lost and the check is lost, it becomes almost impossible to unlock through official channels. Xiaomi service centers strictly require the provision of the original check or warranty card with visible IMEI-code.
⚠️ Warning: Buying devices from hand without checking for no Mi Account binding carries high risks.Make sure the seller is fully logged out of the account and resets when you are in the market.
There is a misconception that flashing the phone will help in this situation, but because the lock is tied to the hardware and server, installing a new version of MIUI or even changing the firmware region (Global to China and vice versa) will not remove the authorization requirement.
Technical methods and the role of the loader
For advanced users who understand the risks, there is a technical aspect of unlocking associated with the bootloader. The official Mi Unlock Tool is designed to remove the bootloader lock, which allows you to install custom Recovery (such as TWRP) and modify system files. However, it is not designed to bypass Mi Account Lock.
Using informal methods such as test points or programmers to flash a memory chip is theoretically possible, but extremely risky. Such manipulations require professional equipment and soldering skills. Mistakes can cause the Xiaomi Mi 8 motherboard to fail completely, turning the phone into a brick without the possibility of recovery.
Risks of hardware unlocking
Some services offer remote unlocking through server vulnerabilities, but this is a grey area. Often such services require remotely transferring access to the device or sending a phone by mail. The reliability of such methods is questionable, and the risk of running into fraud is very high. Officially, Xiaomi does not provide tools to bypass the protection of the owner who does not have a password.
Comparison of Unlocking Methods
To organize information, let's compare the approaches that are available to solve a problem. Each method has its limitations, cost and probability of success. The choice of strategy depends on what evidence of ownership you have.
| Method | Conditions required | Risk of data loss | Legality |
|---|---|---|---|
| Password recovery | Access to phone or email | No. | Completely legal. |
| Contact the service (official) | Check, box, passport. | Yes (full reset) | Completely legal. |
| Unblocking Services (online) | IMEI, payment for services | High (fraud) | The gray area |
| Hardware flashing | Skills soldering, programmer | Critical (breakdown) | Violation of guarantee |
As you can see from the table, the most reliable and secure way to interact with official support channels is to have documents, and the use of questionable services can lead to the loss of money and the device itself, and the IMEI code is a key identifier in all of these processes.
Prevention of blockages and important tips
To avoid this device is locked in the future, there are certain digital hygiene rules that must be followed: Before selling or transferring your phone to another person, always log out of all accounts, and this applies not only to Mi Account, but also to Google Account, as protection of Google FRP can also cause inconvenience to the new owner.
It is recommended to always save the receipts for the purchase of equipment electronically or take photos of them. In the case of the Xiaomi Mi 8, which is no longer a new model, finding the check can be difficult, so a digital copy will be a salvation. IMEI-Device code to a separate location not stored in the phone itself.
⚠️ Warning: Never buy a Xiaomi smartphone if the seller refuses to show login to the menu and no link to the account before transferring money.
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Regular backup of data to the Mi Cloud cloud or to your computer will allow you to safely reset your device in case of blocking, without worrying about photos and contacts.
Use Find Device with caution: If you plan to sell your phone, remove it from the trusted device list on i.mi.com before the reset procedure begins, and this will prevent the locker from automatically activating when a new user first turns on.