Why Xiaomi lost a fingerprint and how to fix it: 7 reasons and 5 ways to solve it

You took a Xiaomi smartphone in your hands, you used to put your finger on the scanner, and nothing happened. No vibration, no unlock, no error. It seems that the fingerprint sensor just disappeared from the system. This problem occurs on models from the Redmi Note 10 Pro to the flagship Xiaomi 14 Ultra, and the causes can be either software failure or physical failure. In this article, we will analyze all possible scenarios, from trivial errors after the MIUI update to damage to the sensor plume.

It's important to understand that missing a fingerprint doesn't always mean a hardware failure. 60 percent of the time, it's a reboot, a sensor reset, or a firmware update. But if the scanner stops working after a phone drop or moisture hits, it's likely to need repairs. We've put together proven diagnostic and recovery methods, and we've put together warnings about what actions might permanently bring the sensor down (like trying to flash unofficial software without a backup).

1. Software glitches: Why the fingerprint disappeared after the MIUI update

The most common reason is the conflict after the firmware update. Xiaomi regularly releases security patches and new versions of MIUI, but sometimes they contain bugs that affect the operation of biometric sensors. For example, after upgrading to MIUI 14.0.5, many users of the POCO F5 and Redmi K50 complained about the disappearance of the “fingerprint” item in the settings.

How does that happen technically? The system can:

• 🔄 Reset security settings – the sensor is physically working, but the system does not see it due to a failure in the configuration file /data/system/locksettings.db.
• 🚫 Block access — MIUI sometimes disables biometrics if detects suspicious activity (e.g., multiple failed attempts to unlock).
• 📱 Reverse drivers – after the update, an outdated version of the scanner driver can be installed (relevant for models with ultrasonic sensors, as in Xiaomi Mix 4).

Before you panic, check:

1. Is there a fingerprint in Settings → Passwords and security?
2. Did not appear a notice of "incompatibility of equipment" (often happens after downgrade firmware).
3. Whether the facial scanner works (if any) – if so, the problem is precisely software.

2. Physical damage: When the scanner died at the hardware level

If the fingerprint is lost after mechanical impact (fall, pressure on the screen, water), with a 90% probability to blame one of the three components:

🔧 How to check for hardware malfunction:

1. Connect the phone to your PC and execute the command: adb shell dumpsys fingerprint If the answer is Service not found - the sensor is not determined by the system (hardware problem).
2. Try adding a fingerprint to Safe Mode (press the power button → Reboot Safe Mode) and if the scanner is running, it's the software's fault.
3. Put a flashlight on the sensor area (for optical scanners under the screen), and if you see a green or red LED but you don't scan, the module is damaged.

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If the sensor stops working after getting moisture, DO NOT TRY drying it with a hair dryer or rice. Optical scanners (for example, in Xiaomi 13) have lenses that can deform when heated, better take it to the service for ultrasonic cleaning.

3. Conflict with custom firmware and Magisk

If you have installed unofficial software (such as LineageOS, Pixel Experience) or Magisk modules, the fingerprint scanner may disappear due to:

• 🔧 Lack of drivers – custom firmware often does not include proprietary drivers for Xiaomi biometric sensors.
• 🛡️ SafetyNet locks – some Magisk modules (e.g. Universal SafetyNet Fix) may interfere with the scanner’s performance.
• 📦 Incompatibility of the kernel - if the firmware is assembled on the basis of the kernel from another model (for example, the kernel from the POCO F4 on the Redmi K50).

🔹 How to return the imprint on the custom firmware:

1. Install the correct drivers via TWRP (look for files with the.ko extension for your model).
2. Disable Magisk security-related modules (SafetyNet Fix, HideProps).
3. Try flashing persist.img from the original firmware (this section stores the sensor calibration).

4. Resetting: When the system "forgets" fingerprints

Sometimes the scanner is physically working, but the system doesn't recognize it because of a malfunction in the settings.

• ⚡ Reset to factory settings (especially if the Mi Account lock has not been disabled).
• 🔄 Clearing the cache through TWRP (Sensor calibration files deleted).
• 📱 Transfer data between phones via Mi Mover (security ID conflict).

⚠️ Note: If you dropped your phone through Fastboot with fastboot erase userdata, critical sensor calibration files could be deleted, in which case only flashing through the Mi Flash Tool with the clean all and lock tick will help (but this will delete all data!).

5. Viruses and malware: Can they turn off the scanner?

Yes, some viruses are able to block biometric authentication to force a user to enter passwords and intercept them.

• 🦠 Fingerprint scanner missing after installation APK source.
• 📱 The phone started to slow down, there was an advertisement in the status bar.
• 🔒 When you try to add a fingerprint, the error Security policy restricts this feature.

🔍 How to check and remove the virus:

1. Run the scan through Google Play Protect (Settings → Google → Security).
2. Install Malwarebytes and check the system for rootkits (some viruses masquerading as system processes, such as com.qualcomm.fingerprint).
3. See the application rights in Settings → Apps → Permissions → Device administrators. If there are unknown programs, delete them.

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Viruses rarely shut down the scanner completely - they usually only block the addition of new fingerprints, leaving the old ones working. If the sensor doesn't respond at all, look for the cause in another.

6. Features of models: why some Xiaomi scanner “die” more often

Some Xiaomi models have design flaws that cause the fingerprint sensor to fail more often than usual:

📌 Redmi Note 8/9/10 — The scanner is located under the screen, and its plume often departs when falling, and these models also suffer from oxidation of contacts after moisture enters.

📌 POCO X3/X3 Pro - Side scanner (in the power button) is sensitive to mechanical damage, often breaks after a strong press.

📌 Xiaomi Mi 11 Ultra – ultrasonic sensor (ultrasonic) can stop working after overheating (for example, if the phone was lying in the sun for a long time).

📌 Redmi K50 Gaming is an integrated sensor that depends on the serviceability of the display module. When you replace the screen, the scanner plume is often damaged.

If you have one of these models, we recommend:

• 🛡️ Use a protective cover for the power button (for POCO X3).
• 💧 Avoid getting moisture (even condensate) on the screen.
• 🔥 Do not leave your phone to heat up above 45.°C (Critical temperature for ultrasonic sensors).

7 What to do if nothing helps: service or self-repair?

If you have tried all the methods, but the fingerprint never appeared, there are two options:

🔧 Self-repair (only if you are confident in your skills!):

• 🔨 Replacement of sensor plume (part cost: 300-800) ₽). Suitable for the Redmi Note series.
• 🔧 Replacement of the entire display module (if the scanner is built into the screen) Price: 5,000-12,000 ₽.
• 📱 Flip-through EDL-Mode (if the problem is software) Requires an authorized Xiaomi account.

🏥 Calling the service:

• 🔍 Diagnostics in the official Xiaomi service (free, but repair can cost expensive).
• 🛠️ Unofficial workshops (cheaper, but risk running into unskilled professionals).

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Before repairing, check if your phone is under warranty. Even if you have opened the case yourself, some service centers are willing to meet if the problem is clearly hardware (for example, after a fall).

⚠️ Note: If you decide to replace the sensor yourself, remember: in models with an ultrasonic scanner (for example, Xiaomi Mix 4), after the replacement, you need calibration through service software.

FAQ: Frequent questions about missing print on Xiaomi