How to turn on and configure the scanner on Xiaomi Mi 9T: fingerprint-to-fingerprint QR-code

Xiaomi Mi 9T

fingerprinter

scanner QR-code

Fingerprint scanner on the Mi 9T It is integrated into the power button and for reading. QR-Both functions depend on the right software and hardware components, and if you bought your phone with your hands or upgraded your firmware, the scanners can be disabled by default. Next are step-by-step instructions for each type of scanner, as well as troubleshooting tips.

Note: all instructions are valid for official MIUI 12-14 versions (including global and European builds).If your Mi 9T runs on custom firmware, some menu items may differ.

1.How to turn on the fingerprint scanner on Xiaomi Mi 9T

The fingerprint scanner on the Mi 9T is located below the screen (unlike later models with ultrasonic sensors) and requires a pre-recording of fingerprints. If the sensor does not respond, first check if fingerprints have been added to the system.

To activate, go to Settings → Passwords and Security → Fingerprint. If the item is missing, then your firmware has disabled sensor support - this may be due to unofficial firmware or resetting settings.

• 🔑 Enter. PIN-code or pattern lock (if not installed, the system will prompt you to create it).
• 👆 Follow the instructions on the screen: press your finger to the power button (where the sensor is located) and raise it when vibration appears.
• ✅ Repeat the procedure for one finger 3-5 times to improve recognition.
• 🔄 Add a backup print (such as the thumb of the other hand) in case the main one doesn't work.

If the scanner doesn’t recognize fingerprints even after registration, try the following steps:

1. Remove all the saved prints and add them again.
2. Wipe the power button with an alcohol tampon - dirt or fat can interfere with reading.
3. Update your firmware to the latest version (see the "Software Update" section below).

Make sure the power button is not physically damaged |

Check if the fingerprint is enabled in the security settings |

Restart your phone after adding a fingerprint|

Update. MIUI up-to-date-->

2 Why the fingerprint scanner doesn't work: common problems

Even after you set it up properly, the scanner may fail, and here are the most common reasons and ways to fix them:

Critical information: If the fingerprint scanner stopped working after the phone fell or moisture hit, don't try to disassemble the device yourself. In the Mi 9T, the sensor is connected to the motherboard with a thin plume that is easily damaged.

Another possible reason is a conflict with applications that use superuser rights (root), and if you have root access, check your Magisk or SuperSU settings to block biometric services.

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If the fingerprint scanner is unstable, try turning off the Face Unlock feature in the security settings, and sometimes the two methods conflict.

3. How to turn on the scanner QR-codes on Xiaomi Mi 9T

Unlike a fingerprint scanner, the reading function QR-The code doesn't require any pre-setting, it's built into the standard Camera app, but many users don't know how to activate it.

To scan. QR-code:

1. Open the Camera app.
2. Point the lens at QR-code (distance - 10-20 cm).
3. Wait for the notification to appear with a suggestion to click on the link.
4. Click on the notification to open the contents of the code in the browser.

If the QR scanner fails:

• 🔍 Make sure the feature is not disabled in the camera settings: go to the camera settings → Additionally. → Scanner. QR-code.
• 📱 Check if a third-party app blocks access to the camera (such as an antivirus or permission manager).
• 🔄 Restart your phone – sometimes the image recognition service “hangs".

For convenience, you can add the QR scanner shortcut to the main screen:

1. Press and hold the empty space on the main screen.
2. Select Widgets → Tools → QR Scanner.
3. Drag the widget onto the screen.

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4. Alternative scanning applications QR-code

If the standard scanner is unstable, you can install third-party apps. Here are the best options for the Xiaomi Mi 9T:

• 📌 Google Lens – built into Google Photos and Google Assistant, supports text and object recognition in addition to QR.
• 🔗 QR & Barcode Scanner (from Gamma Play) – lightweight ad-free app with scan history.
• 🛡️ Kaspersky QR Scanner – Checks links from QR-Security codes before opening.
• 📱 MIUI Scanner – an alternative scanner from developers MIUI (available on GetApps).

When choosing a third-party scanner, pay attention to permissions: the application should not request access to contacts, SMS or geolocation for no reason. Also check reviews - some "scanners" contain advertising software.

To install the app from GetApps (the official Xiaomi store):

1. Open GetApps (Blue Package Icon).
2. In the search, type the name of the application (for example, MIUI Scanner).
3. Click Set and confirm permissions.

5. Update firmware to restore scanners

If the scanners stopped working after updating or resetting the settings, the problem could be in the software. Xiaomi regularly releases patches to fix biometric bugs.

To update the firmware:

1. Go to Settings → About the phone → System update.
2. Click Check for updates.
3. If a new version is available, download it and install it (preferably via Wi-Fi).

If automatic updates do not help, you can install the firmware manually:

• 🌍 Download the latest version MIUI for Mi 9T (codename Davinci from Xiaomi's official website.
• 📁 Place the file in the phone’s root folder (not in the folder!).
• 🔄 Go to Settings. → The phone. → Updating the system → Three dots (menu) → Select a firmware file.

⚠️ Warning: When you manually install firmware, do not interrupt the process or turn off the phone until you fully restart.If the battery is less than 50% drained, plug the charger in.

After the update, check the scanners. If the problem persists, reset the settings (see next section).

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Updating your firmware is the first step in any scanner malfunction, and even if your version of MIUI seems up to date, the server might not have offered critical patches automatically.

6. Resetting and restoring factory parameters

If none of these methods work, the last resort is to reset to factory settings, which will delete all the data from your phone, so back up first.

Resetting instructions:

1. Go to Settings → About Phone → Backup and Reset → Reset settings.
2. Choose to erase all data.
3. Enter. PIN-proof-code.
4. Wait for the process to be completed (it will take 5-10 minutes).

Once reset, the phone will reboot, and you'll need to reconfigure it, including adding fingerprints, and if the scanners work, the problem was a software conflict, and if not, there may be a hardware malfunction.

⚠️ Attention: Xiaomi Mi 9T With the bootloader unlocked, resetting the settings can result in the device being locked (requires re-unlocking via Mi Unlock Tool). → The phone. → Version. MIUI (Press 7 times on "Core Version" → "Loader status").

If the reset didn't work, contact the service center.

• Damage to the fingerprint sensor plume.
• Failure of the biometrics controller.
• Camera problems (for the QR-code).

FAQ: Frequent questions about the scanners on Xiaomi Mi 9T