Modern Xiaomi, Redmi and POCO smartphones offer users many ways to protect their personal data, but it is the face unlock that remains one of the fastest and most convenient options. Unlike a fingerprint scanner that requires physical contact with the body, Face ID (or Face Unlock) technology allows you to access the system instantly just by looking at the screen, this is especially true in situations where the user’s hands are busy, dirty or wearing gloves, making facial recognition technology indispensable in everyday use.
However, despite the obvious convenience, many owners of devices based on the MIUI shell or HyperOS face difficulties in initial configuration or are unaware of hidden security features. Often users activate the basic mode, unaware that machine learning algorithms can work more efficiently if properly calibrated. In this article, we will discuss the activation process, fine-tuning for different models and answer questions about the security of biometric data in the Xiaomi ecosystem.
It is worth noting that the implementation of the function can vary depending on the version of the operating system and the presence of an infrared camera in a particular smartphone. Flagship models often come with more advanced modules that allow unlocking even in complete darkness, while budget devices use software emulation through the front camera. Understanding these differences will help you set up the device as efficiently as possible and protect your gadget from unauthorized access.
Device preparation and system requirements
Before you start directly configuring the biometrics, you need to make sure that your device is fully ready to work with modern security protocols. First of all, check if the current version of the firmware is installed, as older MIUI builds may contain errors in the FaceID module that were fixed in more recent updates. Also make sure that the smartphone screen is clean and the camera does not have protective films or contamination that can distort the image and lead to recognition errors.
An important aspect is the presence of a password set, PIN-The Android system requires a backup authorization method in case facial recognition is not possible due to severe changes in appearance or technical failures. Without a digital code installed, the biometrics setting menu may not be available for activation.
⚠️ Note: If you use third-party launchers or themes that change the system settings menu, temporarily return the standard interface. Modified system files may block access to secure security sections.
To make sure that the lighting algorithms work properly, make sure that the light sensor is not closed. In some Redmi and POCO models, the system uses ambient light data to correct the brightness of the screen when the phone is lifted, which helps the camera focus more quickly on the user's face. Ignoring this moment can lead to delays in unlocking in bright sunlight.
Step-by-step instructions for activating Face Unlock
The process of enabling facial recognition in the MIUI and HyperOS shell is standardized, but requires careful follow-up of all registration steps. To start, open the main settings menu and find the Passwords and Security section, which is usually located at the top of the list or in the System category. This is where all the device access management and data encryption tools are located.
In the menu that opens, select Unlock by face and click on Add Face Data. The system will request confirmation of your identity through the previously installed PIN-Once you've successfully authorized, you'll start a scanning process, where you'll need to slowly turn your head, following the directions on the screen, so that the camera can see your face from different angles.
☑️ Checklist of correct face setting
Once the scan is complete, the system will suggest setting additional parameters, such as unlocking when the screen is off or using vibration when access is successful. It is recommended to activate the “Raise Accuracy” option if it is available for your model, as this forces the neural network algorithms to conduct a deeper analysis of facial features, sacrificing a minimum amount of time for security.
| Setup parameter | Recommended value | Safety impact |
|---|---|---|
| Unlocking in your pocket | Off. | High (Protection against accidental inclusion) |
| Demand a look | Included. | High (protection from sleeping user) |
| Unlock animation | If you wish, | Visual effect does not affect protection |
| Notifications on blocked | Hide the contents | Medium (confidentiality of communications) |
| Data data | Meaning | The result |
| Speed of operation | 0.3 - 0.5 sec | Instant access |
| Accuracy of recognition | 98-99% | Minimum false positives |
| Working in the dark | Depends on the model. | Requires an IR sensor or screen |
Configure security and access parameters
Deep security settings allow Face Unlock to be tailored to the user’s individual needs. The optional unlock settings menu often includes the option “Require Face Data to Unlock” which prevents the phone from opening if the user’s gaze is not directly at the screen, a critical feature for protecting sensitive information in public spaces.
Unlike many competitors, Xiaomi allows you to use biometrics not only to log in, but also to protect access to specific programs through the application protection function. By activating this option in the Applications → Defender section, you can require a face-to-face confirmation every time you launch bank customers, a gallery or instant messengers.
Hidden capabilities of MIUI Security
Remember to update facial data periodically, especially if you change your hairstyle, start wearing glasses or beard. The system has adaptive learning, but dramatic changes in appearance may require manual overwriting of the biometric pattern to maintain high speed. Regular calibration ensures the stability of the identification algorithms in the long run.
Differences between models with and without an IR sensor
Users often don’t realize that face unlock technology on Xiaomi devices is implemented in two fundamentally different ways: flagship models and some mid-range smartphones (Mi series, Xiaomi Number series) are equipped with a separate infrared module that projects an invisible grid of dots on the user’s face, which allows unlocking in complete darkness without turning on the screen and provides a high level of protection against counterfeiting with the help of photography.
At the same time, most low-end Redmi and POCO models use a software method based on analyzing images from a conventional front-facing camera, in which case the function requires a short-term turn on of the screen or backlight, which can be noticeable at night, the speed of this method is usually slightly lower, and security is considered less reliable compared to hardware IR scanning.
⚠️ Note: Software-based unlocking 2D-The image may be less secure and theoretically allow unlocking with a high-quality photo of the owner.
You can determine the type of system installed in your device by looking at the specifications on the official website or paying attention to the behavior of the smartphone in the dark. If the screen does not light up brightly before unlocking, and you hear only a quiet shutter click or vibration, then your device has a full-fledged IR sensor that works independently of the main display.
💡
To improve the work 2D-When unlocking in the dark, turn on the "Brighten when unlocked" function in the screen settings, which will give the camera enough light to correctly analyze the image.
Resolving problems and recognition errors
Despite the advances in technology, users may experience situations where the phone is no longer recognizable or is not operating smoothly. One of the most common causes is contamination of the top of the screen or the area around the front camera with greasy spots or dust. Regularly wiping this area with microfiber often solves the problem of false access failures without the need to reset settings.
Another cause of failures can be conflicting applications or errors in the system process. faceid_service. If you notice that unlocking took a few seconds or occurs after a while, try clearing the cache of the corresponding system application through the Applications menu» → «All applications» → «Settings» → «Memory: This action will not delete your personal data, but will restart biometric services.
In cases where standard methods do not help, it may be necessary to delete old facial data and re-register, and it is recommended to change the angle of the phone during the scan to create a more voluminous and accurate. 3D-Sometimes it is useful to register a face twice, once under normal conditions and once in those where problems are most common (e.g. bright side lighting).
💡
90% of Face Unlock problems are solved with a clean camera, good lighting and biometrics reinstallation.
Comparison of Face Unlock and Fingerprint Scanner
The choice between face unlock and fingerprint scanner often depends on smartphone use scenarios. Face Unlock wins in speed and convenience when the phone is lying on the table or in the hand with the screen to the user. However, the fingerprint scanner, especially built into the screen or side button, remains more reliable in poor light conditions for models without an infrared sensor and when using sunglasses that cover most of the face.
From a security perspective, a fingerprint is considered a more unique biometric identifier, which is more difficult to forge remotely. A person's face can change depending on age, weight, availability of accessories, while the papillary pattern remains unchanged. Therefore, many users prefer a combined approach to authorization in banking applications or use the fingerprint as the main method, and the face as an auxiliary one.
Ultimately, the ideal solution is to use both methods simultaneously, allowing for flexible access control depending on the situation.Modern Xiaomi processors allow you to process biometric data in parallel without creating a burden on the system, making the simultaneous use of Face ID and Touch ID the most rational choice for maximum comfort.