Where did the fingerprint on Xiaomi go: 7 reasons and how to bring the scanner back to life

You're used to trying to unlock Xiaomi with a fingerprint, but the sensor doesn't respond -- no sound, no vibration, as if there were no function. The situation is familiar to many owners of the brand's smartphones, from the budget Redmi Note to the flagship Xiaomi 13 Ultra. In 80% of cases, the problem is solved by yourself in 10 minutes, but sometimes requires the intervention of specialists. In this article, we will analyze all possible causes, from banal contamination of the sensor to critical firmware errors, and give step-by-step instructions for diagnosis and recovery.

It is important to understand that the fingerprint scanner on Xiaomi can “disappear” both physically (the sensor is not determined by the system) and programmatically (the function is disabled in the settings or blocked by the update). 4PDA, Mi Community and service centers to highlight the most common scenarios and effective solutions. If your case is not typical, at the end of this article, you will find a checklist for in-depth diagnostics.

1. Software glitches: When the scanner is "hidden" in the settings

The first thing you need to check is if the fingerprint sensor is disabled. MIUI (especially large, such as the transition to MIUI 14/15) or resetting the function can be deactivated automatically, and third-party applications that have received administrator rights (for example, password managers or cache cleaners) can also be to blame).

How to check:

• 📱 Open the Settings. → Passwords and security → Fingerprint. If there's no item, move to the next section.
• 🔄 Try removing all the fingerprints you saved and adding them again. Sometimes the system forgets the patterns after a failure.
• 🛠️ Enable Developer Mode (click 7 times on Version) MIUI In Settings → About the phone) and check if the debugging item is active USB — Sometimes it blocks biometric sensors.

If a fingerprint error appears in the menu, Failing to connect to the sensor is a sign of a hardware problem (see section 3). If there is no item at all, the biometrics service may be disabled:

Enable Settings → Special facilities → Gesture management → Fingerprint sensor (if any)

Disable Charge Savings in Settings → Battery (limits the operation of sensors)

Remove applications with administrator rights (Settings) → Passwords and security → Device administrators)

Restart your phone in Safe Mode (hold the switch off button) → Safe regime)

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Important: After upgrading to Android 13/14 on some models (Redmi Note) 10 Pro, POCO X3 Pro) fingerprint scanner may be temporarily disabled due to a conflict with Google Play Services, the solution is to upgrade Google services to the Play Market or roll them back to the previous version.

2. Updates MIUI: When the firmware "breaks" the scanner

Xiaomi regularly releases updates to the MIUI, But not all of them are tested for iron compatibility, 3 from 10 The problems with the scanner are related to the "curve" firmware, especially models with ultrasonic sensors (Mi). 10 Ultra, Mi 11) and devices on Qualcomm Snapdragon 7xx/8xx.

Signs of problems after the update:

• 🔴 The scanner stopped working immediately after installing the update.
• 📉 B Settings → The phone. → Version. MIUI Update installed, but the date of the last firmware does not change.
• 🔄 When you try to add a fingerprint, an Equipment Error or Sensor fails to respond.

Decisions:

1. Update rollback: If the problem occurred after the last update, try going back to the previous version MIUI through settings → The phone. → Updating the system → Three points. → Select the service pack. Download the old firmware from miuirom.xiaomi.com.
2. Reset: Hard Reset helps 60% of the time. Attention: it will delete all the data! Instructions: turn off the phone → Hold the volume up + Nutrition → Choose Wipe Data.
3. Handheld firmware via Fastboot: For power users. Download the official firmware for your model with Xiaomi Firmware Updater and run through the Mi Flash Tool.

MIUI Update

Installation of third-party software

Phone drop/blows

By itself (for no apparent reason)

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Critical error: On some devices (Redmi Note 9 Pro, POCO F3) post-update MIUI 14 fingerprint scanner starts to conflict with Google Pay.The solution is to disable Safe Start in Google Pay settings or wait for a patch from Xiaomi.

3. Hardware malfunctions: when the sensor is physically damaged

If the software methods didn't work, the problem lies in the sensor itself or its connection. Xiaomi uses three types of scanners:

• 🔍 Capacitive (on the power button or under the screen) – vulnerable to mechanical damage.
• 🌊 Ultrasonic (under the screen, like on the Mi 11 Ultra) – sensitive to overheating and moisture.
• 💡 Optical (under screen, like on Redmi) K50) — They may fail when falling.

Signs of hardware breakdown:

Self-diagnosis:

1. Put a flashlight on the sensor area (for underscreen scanners), if you see cracks or clouds, the sensor is damaged.
2. Try adding a print in a dark room, and if the screen is not evenly illuminated, there's a problem with the sensor's backlight.
3. Connect your phone to your PC and check logs through adb logcat (look for errors with the Fingerprint tag).

Note: If the sensor is located under the screen (like on Xiaomi) 12T or Redmi K60), Replacing the phone requires a complete disassembly of the phone and repainting of the screen, the cost of repairs in service centers is from 3,000 to 8,000 rubles (2026).

Moisture and corrosion: a hidden threat to the scanner

Even if your Xiaomi isn’t drowning in water, moisture can penetrate microslits and oxidize sensor contacts, especially metal-framed models (Mi 9, Mi 10) and devices that have been in high humidity (bath, rain, sweat), and corrosion of scanner contacts is one of the most insidious reasons, as it does not appear immediately, but after weeks or months.

Signs of moisture exposure:

• 💧 On the screen in the sensor area appear stains or stains (even if they disappear).
• ⚡ Phone accidentally reboots when trying to use scanner.
• 🔋 The battery goes down quickly (corrosion can affect other components as well).
• 📱 B Settings → The phone. → Status. SIM-The card appears a warning Moisture detected (even if the moisture indicator in the tray) SIM dry).

What to do:

1. Turn off the phone immediately and remove it. SIM-card/memory card. Do not turn it on for at least 24 hours!
2. Place the device in a silica gel bag (in shoe or electronics boxes) for 48 hours.
3. After drying, try turning on your phone. If the scanner doesn't work, bring it to the service. Don't try to disassemble it yourself! Corrosion can damage other components.

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If there are scuffs on the screen in the scanner area, DO NOT use a dryer! Hot air can permanently damage the sensor. It is better to leave the phone in a dry warm place (for example, next to the battery) on the screen. 2-3 day-day.

Important: On Xiaomi models with IP53 (For example, Redmi Note 11) protection from moisture is minimal — even sweaty hands are enough to eventually damage the corrosion contacts of the sensor. If you actively use your phone in the gym or on the street, we recommend that you prophylacticly dry the device every six months.

5 Conflict with protective glass and covers

A common but common cause is an incompatible security glass or case, optical and ultrasonic scanners (like the Xiaomi 13 or Redmi). K50) They require direct contact of the finger with the screen, even thin glass with a UV-glue or high-sided case can block the signal.

How to check:

• 🔍 Take the security glass off and check the scanner. If it's working, the problem is the glass.
• 📏 Make sure the case does not cover the sensor area (on some models, for example, POCO F4, The scanner is located very close to the edge).
• 💡 Put a flashlight on the screen in the scanner area, and if you see bubbles or bumps under the glass, it's not installed correctly.

Recommendations for the selection of accessories:

Attention: On Xiaomi models 12S Ultra and Xiaomi 13 Pro scanner integrated into the 2D-So if you use a magnetically fastened case (for example, for wireless charging), it can physically block the sensor from working.

6.Overheating and battery problems

The fingerprint scanner on Xiaomi can shut down when the processor overheats or the battery is critical, and it's a system-wide protection against damage, and most of the time, it's a problem.

• 🔥 Genshin Impact (Call of Duty Mobile).
• ☀️ When using your phone in the sun or in a hot room.
• 🔋 Battery charge over 80% (if Adaptive Charging is enabled).
• 📱 After battery replacement (unoriginal battery may give false signals about overheating).

How to diagnose:

1. Install the app AIDA64 Check the temperature of the processor if it's above 60.°C - the scanner will shut down.
2. Run Settings. → Battery → Battery status. If there's a warning, overheating or battery wear, battery problem.
3. Try using the scanner right after the phone is turned on (when it's cold). If it's working, it's overheating.

Decisions:

• 🧊 Refrigerate the phone (remove the case, put in the shade).
• 🔄 Turn off Adaptive Charging in Settings → Battery.
• 🛠️ If the battery is swollen, replace it immediately, and it's dangerous for the whole device.
• 🎮 For gamers: Enable Performance Mode in Settings → Special facilities → Optimization MIUI, But watch the temperature.

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If the fingerprint scanner is missing after a phone falls or moisture hits, DO NOT try to disassemble it yourself. Mishandling the sensor plumes can completely disable it.

7.When a service center is needed: signs of critical breakdown

If none of the above methods worked, it is likely that the problem requires professional intervention, and here are the exact signs that it is time to carry the phone for repair:

• 🚨 The scanner is not defined in Settings → The phone. → Full specification → Sensors.
• 🔧 When disassembling, it is visible that the sensor plume is severed or oxidized.
• 💥 Phone gives out Fingerprint hardware exception when trying to add a print.
• 🔄 After the firmware through Fastboot, the problem remains.
• 📉 The sensor is working but falsely triggered (unlocked from any touch).

What to do before visiting the service:

1. Make a backup of your data (via Mi Cloud or adb backup).
2. Write it down. IMEI phone (on the box or via *#06#).
3. Check with the service, whether they work with original Xiaomi parts (on sensors often put cheap counterparts that fail in a month).

The cost of repairs in 2026:

Note: If your Xiaomi is warranty, DO NOT open it yourself! at official Xiaomi service centers (list on the site) mi.com/ru/service) They'll replace the sensor for free if it's not your fault, and the warranty doesn't cover moisture damage or mechanical defects.

FAQ: Frequent questions about missing scanner on Xiaomi