Modern Xiaomi smartphones offer a wide range of tools for protecting personal data, and one of the most popular among them is biometric unlocking. Using a fingerprint allows not only instant access to the device, but also to confirm payments, log in to applications and hide confidential files from prying eyes. PIN-Biometrics provides a high level of security combined with maximum ease of use in everyday life.
The process of setting up a scanner in the MIUI shell or the new HyperOS is as simple as possible for developers, but users may have questions about the accuracy of reading or adding several fingers. Proper initial calibration of the sensor plays a key role in the response rate of the system. Next, we will discuss in detail all the activation steps, finesse for left-handed and right-handed people, and methods for eliminating possible sensor errors.
Scanner location and preparation for setting up
Before you start the software part, you need to accurately determine the location of the sensor on your device, as it can vary depending on the model. In modern flagships and mid-segment smartphones, the scanner is most often built directly into the screen, which requires easy touch of a certain area to activate. Budget models or devices of the past may have a physical button on the back or combine the sensor with the on button on the side.
The quality of the reading depends on the condition of the sensor surface and the finger itself. Fat spots, moisture, dirt or a protective film that covers the scanning area can significantly reduce the speed of recognition or make it impossible. Before starting the procedure, it is recommended to wipe the screen or back cover with a soft wipe, and make sure that the finger is clean and dry.
It’s also worth checking if In-Pack mode or other power saving features are enabled that can temporarily block the sensor from working in sleep mode. If you’re using a case with thick sides, make sure it doesn’t interfere with the finger’s tight fit to the surface of the device, especially if you’re using a screen-mounted scanner.
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Before setting up, wipe the screen with an alcohol napkin for electronics - this will remove the fat film and increase the accuracy of the first reading.
Step-by-step activation of biometric protection
To get started with biometrics, you'll need to go to the main settings menu on your smartphone, find a section that could be called Passwords and Security or Fingerprints, Faces, depending on the version of the operating system installed, and that's where all the access control tools for the device are concentrated.
Once you log in, the system will ask you to set or confirm your current unlock password, which is a mandatory security requirement for Android, as biometrics cannot be the only way to access the system in case of a sensor failure or a device reboot. Without digital or graphical code, you will not be able to activate the scanner.
☑️ Preparation for scanning
Then you'll have to scan it directly, you'll have to put your finger on the sensor multiple times, slightly changing the angle of inclination, so that the system can read all the faces of the fingerprint, the screen will show the progress bar, which fills up as you process the data, try to touch the sensor with the same part of your finger that you normally unlock your phone with to improve efficiency in real conditions.
⚠️ Note: Don't add a thumbprint if you're left-handed, but hold your phone in your right hand, and vice versa. The system should read the finger that you're most physically comfortable reaching for the sensor when you take your smartphone out of your pocket.
Adding and managing additional fingerprints
One of the useful features of the Xiaomi platform is the ability to save multiple fingerprints in the memory of the device, which is convenient if the phone is used by different people or if you want to be able to unlock the smartphone with either of the fingers of both hands, which is especially important when using a smartphone with gloves or in an uncomfortable position.
To add a new finger, you need to go back to the fingerprint management menu and select "Add a fingerprint." The process is similar to the initial setting: you will need to attach the selected finger to the scanner several times. The system will assign a new profile a serial number, and you can rename it at any time for convenience, for example, "Right large" or "Indicative".
Removing unnecessary data is done in the same menu, so you can select a specific saved profile and click "Delete." This is irreversible, and you'll have to do it again to activate that finger, check the list regularly, and delete old or incorrect prints so that you don't clutter up the sensor database.
- 👍 Adding a second thumb speeds up work if you change the grip of the device often.
- 👍 You can save your index fingerprint for quick unlocking when the phone is lying on the table.
- 👍 It is recommended to remove prints that were added long ago and work with errors, creating them again.
Advanced Settings and Security Features
In addition to simply unlocking the screen, the fingerprint scanner on Xiaomi devices is integrated deep into the system and can perform a number of additional functions. The fingerprint settings menu often includes the “Use fingerprint for” option, where you can activate confirmation of purchases on Google Play, authorization in banking applications and access to hidden albums in the gallery.
Special attention should be paid to the function “Unlock when the screen is off” If this option is activated, the phone will unlock immediately after touching the sensor, bypassing the step of entering a password or swipe. However, in some cases, such as when the sensor is heavily contaminated, the system may require re-touching or input. PIN-This is a normal defense response.
There is also the ability to hide the contents of notifications on a locked screen until identity is confirmed through a fingerprint, which increases privacy by preventing strangers from reading messages, even if the phone is in your hands but has not yet been permanently unlocked.
Secret function for developers
Comparison of biometric protection methods
The choice between different security methods often depends on the user’s use cases and personal preferences, and to better understand the benefits of a fingerprint, compare it to other available authorization methods in the Xiaomi ecosystem.
| Parameter | Fingerprint. | Unlocking in the face (2D) | pattern lock |
|---|---|---|---|
| Speed of operation | High (0.3-0.5 sec) | Very tall (instantly) | Medium (depending on complexity) |
| Security | Tall. | Low/Mediocre | Medium |
| Working in the dark | Stable. | Requires screen lighting | Requires visual control |
| Accessories dependency | It doesn't matter. | Masks and glasses interfere | Gloves stirring |
As you can see from the table, fingerprints remain the middle ground between speed and reliability. Unlike face recognition from a single camera, which can be fooled by a photo, biometrics from a finger are extremely difficult to forge, and the speed is almost as fast as Face ID in basic models.
It's important to note that using a fingerprint doesn't preclude other methods. You can configure scenarios where either a face, a finger, or a password is required to unlock, choosing the most convenient option in a particular situation. The flexibility of MIUI allows you to combine these tools to achieve maximum comfort.
Diagnostics and Solving Sensor Problems
Despite the reliability of the technology, users may face a situation where the fingerprint on Xiaomi has stopped working, often caused by a software failure or a temporary error of the security module, and the first step in such cases should always be to restart the device, which cleans the RAM and restarts system services.
If the reboot didn’t work, try removing all the saved prints and reconfiguring them, paying special attention to the edges of your finger when scanning, sometimes by cleaning the Security app cache or updating the system to the latest available version, as developers regularly release patches that improve the performance of sensor drivers.
⚠️ Warning: If the sensor has stopped responding after a device hits the water or hits the device hard, the plume or module itself may be physically damaged, and the software methods are powerless and a service center needs to be contacted.
In rare cases, the problem may be with a protective film or glass that is too thick or has an oleophobic coating that distorts the signal. Try temporarily removing the screen protection and checking the scanner. If without the film everything works perfectly, then it is the accessory.
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90% of fingerprint problems are solved by re-registering the finger with a more thorough passage along the edges of the pad.