Why Xiaomi Redmi Fingerprint Scanner Doesn’t Work – Full Reasons and Solutions

The fingerprint scanner on Xiaomi Redmi smartphones is not only a convenience, but also a key security element. When it suddenly stops working, it is annoying: the phone requires you to enter the device. PIN-The code is lost every time, precious seconds are lost, and sometimes the device is locked without being unlocked. But don't panic: 90% of the time, you can solve the problem yourself without going to the service center.

In this article, we’ll look at all the possible reasons why your Redmi fingerprint doesn’t work, from the trivial (dirty sensor or software bug) to the serious (hardware failure), how to diagnose a malfunction, what settings to check first, and what to do if the scanner stops working after the MIUI update. And for the most difficult cases, we’ve prepared instructions for resetting and alternative unlock methods.

Importantly, if your Redmi doesn't respond to touch at all (no vibration, no backlight), the problem is more hardware, and if the scanner sees the finger but doesn't recognize it, the software is to blame. Let's get this straight.

1. Check the obvious: Sensor and finger cleanliness

That sounds trivial, but 30 percent of the time, that's where the problem lies: The fingerprint sensor on Xiaomi Redmi (especially in side-scanner models like the Redmi Note 10 Pro or Redmi 9T) is extremely sensitive to pollution, and dust, fat, sweat, or even hand cream can block the correct reading.

What to do:

• 🧼 Wipe the sensor with a soft lilac-free cloth soaked in alcohol (at least 70%).Do not use wet wipes - they leave a divorce.
• 👆 Wash your hands with soap and dry your fingers. Wet skin distorts your print.
• 🔍 Check if there's any scratches or chips on the sensor, even a micro-crack can disrupt the work.
• 🧴 Avoid applying cream or lotion to your fingers before unlocking.

If the scanner is working after cleaning, the problem is solved. If not, let's move on.

2.Reboot your phone and update the software

Scanner errors are often associated with temporary system failures, especially after installing MIUI updates or third-party applications, and the first thing you need to do is restart the device, which will reset the cache and restart the sensor drivers.

If the reboot didn’t help, check the relevance of the firmware:

1. Go to Settings → About the phone → System update.
2. If a new version of MIUI is available, install it.
3. After the update, be sure to restart the phone.

In some cases, the scanner will stop working due to beta versions of the firmware. If you participate in the MIUI testing program, roll back to the stable version via Settings → About Phone → MIUI version → Select stable firmware.

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If the scanner still doesn’t work after the upgrade, try rolling back the firmware via Fastboot (instruction in Section 6).

3. Remove and add the print again

Sometimes the fingerprint database gets damaged and the scanner can't recognize even the right fingers, so the complete removal and re-registration of the fingerprints can help.

Instructions:

1. Open Settings → Passwords and Security → Fingerprints.
2. Remove all the prints (even if they appear to be working).
3. Reboot the phone.
4. Add the fingerprint again, following the instructions on the screen, press your finger tightly when registering, and cover the entire area of the sensor.

Important: When adding a fingerprint, don’t use the same finger at different angles (e.g., the thumb of the right hand as a separate fingerprint and the side of the finger as the other).

4. Check security settings and permissions

Sometimes the fingerprint scanner is blocked because of conflict with security settings or third-party apps, for example, if you have turned on Child Mode or activated Safe Mode, the scanner can be disabled automatically.

What to check:

• 🔒 Make sure that in the settings → Passwords and security not activated application blocker or protection against unauthorized access.
• 📱 Check if Safe Mode is on (hold the power button and look in the lower left corner of the screen).
• 🛡️ Open the Settings. → Annexes → Permits → Fingerprints and make sure that scanner access is not blocked for system applications.
• 🔄 If you have recently installed an antivirus or optimizer (e.g. Clean Master, 360 Security), temporarily uninstall it.

It's also worth checking if Auto Lock is enabled for prolonged inactivity in the lock screen settings, and sometimes it resets the scanner settings.

5. Diagnostics of hardware problems

If all software methods have been tried, but the scanner still doesn't respond, the problem may be hardware.

• 🔴 The sensor does not vibrate or illuminate when touched.
• 💥 The phone fell or got wet before the problem appeared.
• 🔌 The print does not work even after a complete reset (Section 6).
• 📱 The screen appears a message: fingerprint scanner error or Sensor does not respond.

What you can do on your own:

1. Check the sensor plume (if you've taken the phone apart), sometimes it goes away after a fall.
2. Dry the phone if it gets wet. Put it in rice or silica gel for 24 hours.
3. Check if the sensor is heating up. If it's hot, it's possible that the controller will fail.

If you are not sure about your skills, it is better to contact the service center.Self-repair fingerprint scanner on Xiaomi Redmi without experience can lead to a complete loss of functionality of the sensor.

Extreme measures: resetting and flashing

If none of the previous methods worked, there are radical ways to reset to factory settings or flash through Fastboot. These methods will delete all data from the phone, so make a backup beforehand.

Reset to factory settings:

1. Go to Settings → About the phone → Reset settings.
2. Choose to erase all data.
3. Confirm the action and wait for the reboot.

Fastboot Flashing (for experienced users):

1. Download the official firmware for your model from the Xiaomi website.
2. Install the Mi Flash Tool on your PC.
3. Transfer the phone to Fastboot mode (clip Power + Volume down).
4. Connect your phone to your PC and run through the Mi Flash Tool.

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Fastboot flashing removes all data, including fingerprints, and restores the sensor’s factory drivers.

⚠️ Note: If you use Redmi with a bootloader unlocked, flashing may result in the device being locked. Before the procedure, check the bootloader status via the fastboot oem device-info command.

7. Alternative ways to unlock if the scanner is not working

If the fingerprint scanner is permanently out of order and repairs are delayed, alternative unlocking methods can be configured:

• 🔐 PIN-A code or pattern lock is the most reliable backup option.
• 👤 Facial recognition (available on front-facing camera models, such as the Redmi Note 11 Pro).
• 📍 Smart Lock – Automatic unlocking in trusted places (home, work).
• 🔑 External scanner (via Bluetooth or USB-C) — business-model-suitable.

To enable facial recognition:

1. Go to Settings → Passwords and Security → Face Recognition.
2. Follow the instructions on the screen (you will need to turn your head in different directions).
3. Set up an alternative unlock method (PIN or pattern lock) in case of failures.

Note: facial recognition is less secure than a fingerprint, as it can be fooled by a photo (on budget Redmi models).

8.When to contact the service center

If you’ve tried all the techniques from this article, but the fingerprint scanner on your Xiaomi Redmi is still not working, it’s time to reach out to the professionals.

• 🛠️ Sensor physically damaged (cracks, dents, traces of oxidation).
• 🔌 The phone doesn’t respond to any prints, even after flashing.
• 💦 The device got wet or overheated.
• 📵 Diagnostics with #4636## shows sensor error.

How much does it cost to repair a fingerprint scanner at a service center, and it costs from 1,500 to 4,000 rubles, depending on the model.

Before the service visit:

1. Make a backup copy of the data.
2. Check if the center has original parts for your model.
3. Check if the warranty is maintained after the repair.

⚠️ Note: Some service centers offer “cheap” repairs using non-original sensors, which can lead to loss of functionality (for example, the scanner will only work after a reboot) or problems with updates. MIUI.

FAQ: Frequent questions about the fingerprint scanner on Xiaomi Redmi