The fingerprint scanner on Xiaomi smartphones is one of the most convenient ways to unlock, but sometimes it stops working for no apparent reason, sometimes it doesn't recognize touch, then it gives an error "Fingerprint scanner does not respond", then the option to add new fingerprints to the settings disappears completely. In 80% of cases, the problem is solved software, but sometimes hardware breakdowns or factory defects are to blame.
In this article, we will analyze all possible causes - from banal contamination of the sensor to firmware failures after the update. MIUI/HyperOS. You'll learn how to diagnose a malfunction, what settings to check first, and when to carry your phone to the service, and we'll also learn more about the features of scanners on models with a high-speed system. AMOLED-screens (built-in sensor) and mechanical buttons (Redmi Note) 8/9, POCO X3) — They have different "weak spots».
1. Checking the obvious: pollution, film, cover
Start with the simplest thing, physical cleaning of the sensor, and the sensor under the screen or the mechanical button accumulates fat, dust and microparticles over time, which block the fingerprint reading. 12/13 series, Redmi K50 and other models with built-in scanner: their sensor is located directly under the display glass.
What to do:
- 🧼 Wipe the sensor with a soft, lilaless napkin dipped in alcohol (at least 70.
- 📱 Remove the protective film or glass – they can interfere with the infrared scanner (on models with the use of the device). AMOLED).
- 📦 Check if the cover is pressing on the sensor area (relevant to the POCO F4, Redmi Note 11 Pro+).
- 💧 If your phone has recently come into contact with water, let it dry for at least 12 hours – moisture can cause false positives.
⚠️ Warning: Do not use abrasive materials (such as paper wipes) – they scratch the glass over the sensor, which worsens its performance.
If the scanner is working after cleaning, but the problem comes back after a while, the reason may be poor quality of protective glass. Cheap films with AliExpress often block the scanner’s IR rays. The best option is original glass from Xiaomi or proven brands (for example, Spigen, Nillkin).
2. Software failures: reboot, cache, safe mode
If the sensor is clean, but the scanner is still not working, the software is to blame.
- 📱 Updates MIUI/HyperOS (especially in beta versions).
- 🔄 Install third-party launchers or themes (e.g. Nova Launcher, Icon Pack Studio).
- 🛠️ Rooting or unlocking the loader.
- 📲 Conflict with blocking applications (e.g. AppLock, Cerberus).
Step-by-step diagnostics:
- Reboot the phone – this will reset the temporary errors of the scanner drivers.
- Run in Safe Mode: 1. Press the power button before the turn off menu appears. 2. Press and hold "Switch off» → If the scanner is running, the third-party application is to blame (see section 3).
- Clear the cache and scanner module data: Settings → Annexes → Application management → Three points (⋮) → Show system-based → Biometric service → Warehouse → Clear the cache/data
- Check the developer settings: Settings → The phone. → Version. MIUI (click 7 times) → Back to Settings → Additionally. → For developers → Turn off the debugging. USB» and "OEM-unlock" (if included).
☑️ Checklist before resetting settings
If the scanner still doesn’t work, try resetting your biometrics settings:
- Go to Settings → Passwords and Security → Fingerprints.
- Delete all the fingerprints you saved.
- Reboot the phone.
- Add the print again by following the instructions on the screen.
⚠️ Note: On some models (Xiaomi) 11T Pro, Redmi K40) After resetting the biometrics, you may need to re-link the Mi Account!
3. Application Conflict: How to Find and Resolve
If the scanner is running in safe mode, but fails in normal mode, one of the installed applications is to blame.
- 🔒 Applications for blocking (AppLock, FingerSecurity).
- 🛡️ Antivirus with fingerprint scanning function (360 Security, Cheetah Mobile).
- 🎮 Programs for emulation of presses (Game Turbo, Octopus).
- 📱 Deep Integration Launchers (Microsoft Launcher, Apex Launcher).
How to find a problem application:
- Go to Settings → Applications → Application Management.
- Sort the list by installation date (new apps are more likely to cause conflicts).
- Turn off suspicious programs in turn, checking the scanner.
You find the culprit? Delete it and restart the phone. If the app is critical (like corporate antivirus), try:
- 🔄 Update it to the latest version.
- 📋 Disable permissions to access biometrics (Settings) → Confidentiality → Permits → Biometry).
- 📧 Write in support of the developer with a description of the problem (specify the phone model and version) MIUI).
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If the scanner stopped working after installing the HyperOS shell, try rolling back to the stable version. MIUI Fastboot. The instructions are on the forum. XDA Developers or in Mi Community Telegram Channels.
4. Failures after the update: rollback of firmware and manual flashing
Updates MIUI HyperOS often breaks the fingerprint scanner, especially risky:
- 📌 Beta versions of firmware (for example, MIUI 14.0.23.4.10.DEV).
- 📦 Regional firmware (e.g. Global installation) ROM Chinese-style).
- 🔄 Automatic updates “over the air» (OTA) interrupted.
How to fix it:
| Problem. | Decision | Models that help |
|---|---|---|
| The scanner doesn't respond after OTA-update | Reset the settings to factory (Settings → About the phone → Resetting) | Redmi Note 10/11, POCO X3/X4 |
| Error: "The fingerprint scanner is not responding" | Roll back the firmware via Fastboot (instruction below) | Xiaomi 12/13, Mi 11 |
| No prints are saved. | Clean the cache section in Recovery | Redmi K50, POCO F4 GT |
| The scanner works once. | Refuse the module persist through EDL | Xiaomi Mix 4, Black Shark 5 |
Instructions for rolling back firmware through Fastboot:
- Download the official firmware for your model (choose a stable version!).
- Unpack the archive in the platform-tools folder (from Android SDK).
- Connect your phone to your PC in Fastboot mode (clip Volume Down + Power when your phone is off).
- Commands: Fastboot Flash boot boot.img fastboot flash system system.img fastboot flash vendor vendor.img fastboot reboot
What to do if the phone is stuck on the MI logo after firmware?
5. Hardware malfunctions: how to diagnose
If the software methods didn't work, it's hardware. Common reasons:
- 🔌 Oxidation of contacts of the scanner plume (relevant after moisture is ingested).
- 🔧 Damage to flexible plume when disassembling the phone.
- 🔋 Failure of the sensor power controller (on models with built-in scanner).
- 💥 Mechanical damage to the sensor (cracks, chips).
How to check:
- Call the multimeter plume (if you have experience repairing). on Xiaomi with a mechanical scanner button (Redmi Note) 8/9) resistance must be ~5 kom.
- Check the power circuit of the sensor. SY8827 or FPC1025 (model-wise).
- Connect your phone to your PC and check logs through ADB: adb logcat | grep -i If there are errors in the logs FingerprintHal: Error opening device - the problem is in the hardware.
Typical "symptoms" of hardware breakdowns:
- 🔴 The scanner does not respond to touch (not even vibrations).
- 🔄 It works again, only at a certain angle.
- 💡 Sensor illumination (on AMOLED-models) shall not light up when pressed.
- 🔊 Error "Equipment Error" appears in the settings.
⚠️ Note: On models with built-in scanner (Xiaomi 12 Pro, Mi 11 Ultra) self-repair attempts can cause damage. AMOLED-If you're not sure about your abilities, go to the service.
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If the scanner stopped working after the phone fell or moisture got in, 90 percent of the fault is hardware failure, and software methods won't help here, you need a diagnostic at the service center.
6. Features of models: built-in vs mechanical scanner
Xiaomi’s fingerprint scanning technology is model-dependent, affecting typical faults and how they are fixed.
| Type of scanner | Xiaomi models | Frequent problems | Decisions |
|---|---|---|---|
| Built-in (under the screen) | Xiaomi 12/13/14, Mi 11, Redmi K50 | Does not respond to wet/dirty fingers, slow recognition | Clean the sensor, update the firmware, calibrate in the engineering menu (#6484##) |
| Mechanical button | Redmi Note 8/9/10, POCO X3, Mi 9T | Wear button, contact oxidation, error "Scanner is not responding" | Replacement of button, cleaning of contacts, checking of the plume |
| Side (on the power button) | POCO F3, Redmi Note 11 Pro, Xiaomi 11 Lite | False positives, slow reaction | Recalibration, resetting, button replacement |
For models with built-in scanner (Xiaomi 13 Pro, Redmi) K60) The quality of the protective glass is critical. Cheap films block the infrared LED, and the sensor stops "seeing" the finger. Check the compatibility of the glass with your model on the manufacturer's website.
On phones with a mechanical button (Redmi Note 9 Pro, POCO X3 NFC) The most common thing that happens is that the micro-switch under the button fails:
- The power button is falling or wedging.
- The scanner only works when pressed hard.
- There is a double click at one click.
In this case, only the replacement of the button will help. The cost of repair in the service is from 1,500 to 3,000 rubles (depending on the model).
7. When to contact the service: prices and warranty
If you've tried all the methods, but the fingerprint scanner never worked, it's time to bring the phone to the service.
- 🔧 The scanner is physically damaged (cracks, dents).
- 💧 The phone fell or came into contact with water.
- 🔌 In the lairs ADB FingerprintHal: Hardware Error.
- 📉 The problem arose after a failed firmware through EDL.
Cost of repair in official Xiaomi services (2026):
- 🔄 Replacement of scanner plume: 2,000–4,000 ₽.
- 🔧 Replacement of a mechanical button with a scanner: 2,500–5,000 ₽.
- 📱 Replacement of the built-in scanner module (by AMOLED-models: 5,000–8,000 ₽.
- 💧 Cleaning from oxidation after moisture: 1,500–3,000 ₽.
Important on the guarantee:
- If the phone is warranty, do not disassemble it yourself - this will void the warranty.
- For repairs under warranty, you need a box, a check and an intact seal.
- If the scanner breaks down after rooting or firmware, the warranty does not apply.
⚠️ Note: Unofficial services may install a non-original scanner that will work worse or not recognize fingerprints at all, FPC1025-XXXXX For the Redmi Note 9).
8.Prevention: How to prolong the life of a scanner
To make the fingerprint scanner on Xiaomi last a long time, follow the simple rules:
- 🧼 Clean the sensor regularly with an alcohol napkin (1 time per week).
- 🚫 Do not use aggressive detergents (acetone, gasoline).
- 💧 Avoid getting moisture on the scanner area.
- 🔋 Do not discharge your phone below 10% – this can cause a failure of the biometrics controller.
- 📱 When installing protective glass, choose models with a cutout under the scanner.
- 🔄 Do not update your firmware in beta if the scanner is critical.
For models with built-in scanner (Xiaomi 13, Redmi) K60) recommended:
- 🌡️ Avoid overheating your phone (do not play heavy games when charging).
- 🔦 Do not use your phone in direct sunlight – it can damage the IR sensor.
- 🔋 Turn off fast charging while adding new prints (some models cause crashes).
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If the scanner started to “glutch” after installing custom firmware (for example, LineageOS or Pixel Experience), go back to the official version of the scanner. MIUI. In most custom assemblies, biometric drivers work unstablely.