Owners of Xiaomi, Redmi and Poco smartphones often notice a mysterious service called MIUI Biometric in their running processes or application settings. The appearance of an unknown system component always raises questions: is it a virus, why the process accesses the camera or storage, and can be removed to save battery life. This system module is an integral part of the MIUI shell and is responsible for the operation of the biometric protection of the device.
If you don’t use face unlock or fingerprint, it can be a waste of resources. However, MIUI Biometric is tightly integrated into the Android security core, encrypting your personal data and banking applications. Understanding how it works will help you avoid errors that can lead to a complete lockdown of your smartphone or crashes in critical functions.
In this article, we will take a closer look at the functionality of the service, analyze its impact on performance, and answer the most frequent user questions, explain why the system can require constant permissions and how to properly configure biometrics for maximum protection without compromising autonomy.
Basic function of the security service
The main task of MIUI Biometric is to manage all the biometric sensors installed in your device. In modern Xiaomi smartphones, it is not only a fingerprint scanner built into the screen or power button, but also complex facial recognition algorithms (Face ID), the program acts as an intermediary between the hardware (sensors) and the Android operating system.
When you touch a scanner, it's this process that reads the data, compares it to an encrypted reference, and gives you a command to unlock. It's important to understand that the biometric data itself is stored in an isolated secure part of memory that ordinary applications do not have access to. MIUI Biometric has privileged access to this storage, which is what is suspicious among attentive users who monitor access rights.
⚠️ Warning: Attempts to forcefully stop this process through the developer’s settings may cause the fingerprint scanner to stop responding until the next device restarts.
In addition to unlocking the screen, the service ensures that the authorization in the applications works. When a bank or messenger asks to confirm the operation with a fingerprint, the request is processed by this system module. Without it, the Smart Lock function and automatic password filling will also cease to function correctly.
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If you don’t use biometrics at all, don’t delete system files associated with it anyway, as this could compromise the integrity of the security check when you boot Android.
Why does the process consume resources and battery?
Many users have noticed that MIUI Biometric may appear on the battery consumption list, especially after system updates.This is because the module constantly polls sensors in the background, waiting for a signal to touch or face in the sight of the front camera. On older smartphones such as the Redmi Note 8 or MI 9, this may be more noticeable due to a less efficient processor.
Excessive charge consumption often indicates a software failure when the process “hangs” in the cycle of reading attempts. This can occur if the screen protective glass is damaged, the finger is wet, or if dust has accumulated in the speaker hole that interferes with the ultrasonic scanner, in which case the system tries to repeat the readout attempt over and over again, using energy.
- 🔋 Background activity: The process works continuously to provide an instantaneous touch response, which requires minimal but constant current.
- 📸 Camera use: For face unlock function, the module periodically activates IR illumination or camera, which is an energy-intensive operation.
- 🔄 Data Synchronization: After Updating the Firmware MIUI biometric keys are re-indexed, which temporarily increases the load on the CPU.
If you notice that the phone is warming in the area of the camera or scanner, and biometrics is leading in statistics, try clearing the service cache. To do this, go to Settings → Apps → All apps, search in the Biometric list and select Clear Cache. Don’t confuse it with the Clean All Data button, as this will delete your saved fingerprints.
Required permissions and access to data
To work properly, MIUI Biometric requires a wide range of resolutions that may seem excessive at first glance: the module needs access to a camera to scan the face, access to a storage facility to reconcile fingerprint hashes, and access to the network to synchronize security keys with a Google or Mi Account.
This is due to Android security policies: using Bluetooth scanning for Smart Lock (when the phone is not locked next to a trusted device) requires geolocation permission, without which Biometric will not be able to determine if you are in a safe area.
| Type of permit | What is used for | Can I turn it off? |
|---|---|---|
| Camera. | Facial recognition (Face ID) | No (Face ID will stop working) |
| Warehouse | Preservation of fingerprint patterns | No (system won't start) |
| Microphone | Voice activation (rarely) | Yes, if not used. |
| Phone. | SIM identification for protection | No (disturbing security) |
Users often ask if MIUI Biometric transmits fingerprint data to Xiaomi's servers, and the answer lies in the Android security architecture: biometric data never leaves the device or goes to the cloud. It's stored in a Trusted Execution Environment (TEE) chip isolated from the main operating system, and even if a virus enters the phone, it won't be able to read that data directly.
⚠️ Note: If a third-party app requests direct permission to use Biometrics, check its reputation. The system module handles the scan itself, and the applications only get a yes or no response».
Instructions for setting up and optimizing
To ensure that biometrics work smoothly and minimize read errors, you need to adjust the scanner sensitivity correctly. Newer versions of MIUI have a sensitivity enhancement feature for protective glasses. If you have thick glass pasted, include this option in the Settings menu → Passwords and security → Fingerprints can significantly speed unlocking.
It is also recommended to update the fingerprint database periodically. If you notice that the phone is less able to recognize your finger, delete the old fingerprint and add it again. When you add it, try to touch the scanner with different parts of your finger, not just the center, so that MIUI Biometric creates a more complete digital profile.
☑️ Optimizing biometrics
It is important for owners of models with subscreen scanners to know that the brightness of the screen affects the speed of operation. When the brightness is low, the system automatically increases (amplification) of the sensor, which can slow down the reaction. In the display settings, you can try to turn off Adaptive Brightness and check if unlocking becomes faster at a fixed level of 50-70%.
The secret to high speed
Possible problems and methods of solving them
The most common problem is the message “No biometric data was used” or the scanner’s indicator rotating endlessly, often due to overflowing security cache, and unlike conventional applications, simple cache cleaning may not help, and a deeper approach is required through the recovery menu or reset security settings.
Sometimes the conflict arises after installing Google security patches. If the fingerprint has stopped working after a monthly update, try to remove updates to the Google Play Services for AR component or Google Play Services itself, as they may conflict with MIUI Biometric drivers.
- 🛑 Failure after update: Often solved by resetting network and Bluetooth settings as modules are linked.
- 💧 Moisture in dynamics: If water gets into the scanner area, the system can block the biometrics until it is completely dry.
- 📱 Topics Conflict: Third-Party Design Themes from the Store MIUI Themes can change system fonts or icons by breaking the password window interface.
In extreme cases, when software methods don’t work, you may need to reset completely to factory settings.Be sure to back up your data before doing so, as all biometric keys will be lost irretrievably and will have to be recreated.
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90% of Xiaomi’s biometric problems are solved by removing old fingerprints and re-registering your fingers in bright light.
Is it safe to remove the system component?
The issue of removing MIUI Biometric is a challenge for those who want to make the system as easy as possible, technically a system-based and secure process, which is impossible to remove by standard means without a superuser (Root) right, and even with Root rights, removing this component is highly discouraged, because it is tied to many system libraries.
If you are forced to remove the package through ADB-When you have a command or system editor, you run the risk of a bootloop or a broken lock screen. Android security checks the integrity of critical processes at start, and the absence of a biometric module can be regarded as a violation of the integrity of the system.
pm disable-user --user 0 com.miui.biometricThis command in ADB allows you to disable the process without deleting, which is safer. However, even in the frozen state, there may be errors in the interface, for example, no more call notifications if you use the "Raise to Answer" function, which is often associated with proximity sensors and biometrics.
⚠️ Note: Using scripts to “cut” Xiaomi system applications may lead to loss of warranty and inability to receive official firmware updates over the air (OTA).
The best alternative to deletion is a smart setup. If you're not using biometrics, just don't add fingerprints and face to the settings, in which case the process will consume minimal resources while in sleep mode and will not interfere with your daily smartphone operation.