Why Xiaomi lost a fingerprint: 7 reasons and ways to bring the scanner back to life

You took a Xiaomi smartphone, you put your finger on the scanner, and nothing happened. No vibration, no unlock, no error. It seems like the fingerprint sensor just disappeared from the system. This problem is found on models from the Redmi Note 10 Pro to the flagship Xiaomi 13 Ultra, and the causes can be hidden in software failures and physical malfunctions.

In this article, we'll not just list the possible culprits, but we'll look at specific scenarios where a fingerprint disappears after a MIUI update, a phone crash, or even for no apparent reason; you'll learn how to diagnose a problem yourself, which settings to check first, and when to exactly carry the phone to the service; and we'll also uncover a little-known bug in MIUI 14 that can "hide" from the security menu without a trace.

1. Software failures: when firmware or settings are to blame

In 60 percent of cases, the missing fingerprint is not hardware, but software, most often after:

• 📱 Updates MIUI — Especially when switching to a new version (e.g., with a new version). MIUI 13 on MIUI 14).
• 🔄 Settings reset – even a partial reset can “nullify” scanner data.
• 🛠️ Manual intervention – deleting system files through ADB rat.
• 🔋 Deep battery discharge – sometimes causes a safety module to fail.

The first thing you need to do is restart the phone in safe mode, and if the print is triggered, it is the fault of a third-party application (most often "optimizers" or anti-voruses).

1. Open Settings → Passwords and Security → Fingerprint.
2. If there is no item, try to enter the search for the settings request fingerprint.
3. If the system says “Not detected” it is already a hardware problem (see section 4).

Sometimes it helps to reset the scanner settings without deleting the data:

adb shell cmd fingerprintd reset

This command must be entered through ADB (configuration instructions in section 3). If the sensor appears in the settings after it, but does not work, try re-registering the prints.

2. Conflict with MIUI updates: bugs and workarounds

Versions of MIUI 14.0.3–14.0.6 for some models (Redmi Note 11 Pro+, Xiaomi 12T) contained a critical bug: after the update, the fingerprint scanner disappeared from the interface, although it physically remained working.

How to check if this is your problem:

• 🔍 Go to Settings. → The phone. → Version. MIUI.
• 📝 Compare with the official list of bugs (link to the forum Xiaomi).
• 🔄 If the version gets hit by a bug, try rolling back to the previous firmware via Fastboot.

If rollback is not an option, try manually running the scanner service:

adb shell am start -n com.android.settings/.Settings$FingerprintEnrollIntroductionActivity

⚠️ Attention: Firmware rollback erases data! pre-reverse through Settings → Additionally. → Backup and reset. Don't use tools like Mi Flash to roll back without unlocking the bootloader, it will cause the device to blink.

3. Diagnostics through ADB: how to check the operation of the sensor

If the scanner doesn't show up in the settings, but you suspect it's physically fit, you can check it through ADB (Android Debug Bridge), which will help you distinguish between a software failure and a hardware breakdown.

Instructions:

1. Enable USB debugging in Settings → About Phone → MIUI version (click 7 times on the line with the version, then go back to Settings → Additional → For Developers).
2. Connect the phone to the PC and confirm the debugging permission.
3. Enter in the command line: Adb devices (you should see your device).
4. Check the scanner status: adb shell dumpsys fingerprint

What do the results mean?

• 🟢 mHalDevice = com.qualcomm.fingerprint@1.0::IFingerprint/default — sensor detected, software problem.
• 🟡 No fingerprint hardware detected - sensor not found (possible breakage or disconnection in the firmware).
• 🔴 Fingerprint service not running - service not running (try adb shell cmd fingerprintd start command).

Install ADB-PC drivers|

Enable debugging over USB on Xiaomi|

Connect the phone and confirm permission |

Execute the command `adb shell dumpsys fingerprint`|

Analyze the conclusion (see section above)-->

If the output has a line vendor.qti.hardware.fingerprint@3.0-service, but the scanner is not working, the problem may be corrupted configuration files. Try to delete them (Root required):

adb shell


su




rm -rf /data/system/users/0/fpdata/*




rm -rf /data/system/fingerprint/*




reboot

4. Hardware malfunctions: when you need to service

If all the software methods have been tried and the scanner still doesn't work, it's probably the hardware problem.

• 💥 Fall or impact – even if the phone is intact, microcracks on the board can disrupt the sensor connection.
• 🌊 Moisture ingestion – oxidation of scanner contacts (often found after “bathing” or use in humid climates).
• 🔌 Disconnection of the plume – when disassembling the phone (for example, to replace the battery) could not connect the sensor back.
• ⚡ Overheating – if the phone overheated frequently (e.g. during games), the scanner controller may have failed.

How to diagnose:

1. Light a flashlight on the scanner area – if you see bloating or corrosion, it is 100% hardware breakdown.
2. Shake the phone – if you hear an extraneous noise (for example, rattling), the plume may have gone away.
3. Check if the vibration works when the scanner is touched – if so, the sensor receives power but does not transmit data.

⚠️ Warning: Don't try to disassemble the phone yourself if you don't have experience! on Xiaomi models 12/13 The print scanner is integrated into the display, and replacing it requires a complete disassembly of the screen. OLED-Matrices (cost of replacement - up to 70% phone price).

Average prices for repairs in service centers (2026):

5. The scanner works, but does not recognize fingerprints: what to do

Sometimes the sensor is on, but it doesn't recognize even the fingerprints that it has stored, or it's constantly asking you to try again.

• 🧴 Dirt or fat on the scanner (especially relevant for underscreen sensors).
• 🩹 Skin damage on the finger (cuts, calluses, wet hands).
• 🔄 Too many fingerprints saved (MIUI Limits the number to 5, but the bug can reduce the limit to 1-2).
• 📉 Sensor wear – over time (3-5 years of use) sensitivity decreases.

Decisions:

1. Clean the scanner with an alcohol tampon (for underscreen sensors, use soft lilaless fabric).
2. Remove all fingerprints and add them again by pressing your finger at different angles (especially important for Goodix and FPC sensors).
3. Turn off the Unlock function when the screen is off in the fingerprint settings – sometimes it conflicts with recognition.
4. Try adding the same finger twice under different names (e.g., "Indicative" and "Indicative 2").

💡

If you have a Xiaomi scanner that is subscreened (like the Mi 11 Ultra or 12 Pro), never use abrasives or harsh chemicals to clean your screen. They scratch the sensor's protective coating, which makes it hard to recognize fingerprints. Only distilled water or special wipes for optics are suitable for cleaning.

If nothing helps, check the sensor logs:

adb shell logcat | grep -i fingerprint

Look for error lines like FingerprintError: TIMEOUT or Too many failed attempts. One indicates a hardware problem, the other indicates a need to re-register fingerprints.

6. Alternative methods of unlocking if the scanner is not working

While you're looking for a solution, the phone needs to be unlocked somehow. Here are all the ways Xiaomi can do it:

• 🔐 PIN-Password/code – if you have installed it with your fingerprint.
• 📷 Facial recognition (works even with a faulty scanner).
• 📍 Smart Lock – unlocking by trusted place, device or voice (configured in Settings) → Passwords and security → Smart Lock).
• 🔑 Emergency PIN — If you have set it up via Mi Account (only works when you are connected to the Internet).

If you forgot. PIN-code, and the scanner doesn't work, so you just have to reset it with Mi Account (requires account binding) or hard reset (erase all data:

1. Turn off the phone.
2. Press the Power button + Volume up until the Mi logo appears.
3. Select Wipe Data → Wipe All Data (control – volume buttons).
4. Confirm the reset and wait for the reset.

⚠️ Warning: On phones with a locked bootloader (Xiaomi blocks it by default), a reset via recovery can lead to a request for an old one PIN-If you don't remember it, it's going to be a brick, and then only an official proof of ownership service will help.

7.Prevention: How to avoid scanner problems in the future

To make the fingerprint scanner on Xiaomi last longer:

• 🛡️ Use cases with a cutout under the sensor - pressure on the scanner can damage the plume.
• 🚿 Avoid moisture, even if the phone has protection. IP53, The scanner is often vulnerable.
• 🔋 Do not allow deep discharge – this can knock down the settings of the security module.
• 📱 Update. MIUI timely, but don’t put bat versions – they often contain scanner bugs.
• 🔄 Re-register fingerprints every 3 months – this resets the accumulated recognition errors.

For models with a subscreen scanner (Xiaomi 13 Pro, Mix 4):

• 🌡️ Do not use your phone at a temperature below -10°C – the sensor may temporarily shut down.
• 💡 Do not adjust automatic brightness to maximum – it accelerates wear OLED sensor.

💡

If you use a fingerprint scanner frequently, turn off the “Rise to Wake” feature (Settings → Screen → Raise to Wake up) which makes the sensor work in the background, which reduces its life by 20-30%.

FAQ: Frequent questions about missing print on Xiaomi