Xiaomi Poco X3 Pro is equipped with a side-by-side fingerprint scanner that not only unlocks the device, but also protects sensitive data in applications. However, many users face problems: the sensor does not recognize the finger, works with a delay or refuses to save the fingerprint. In this article, we will discuss the step-by-step configuration of the scanner, optimization of its operation and ways to eliminate typical errors, from calibrating the sensor to resetting security settings.
The Poco X3 Pro features a side-mounted sensor integrated into the power button, which is convenient for quick unlocking, but requires the right fingerprint recording technique. We have tested all the configuration methods on MIUI 12.5 and MIUI 13 firmware, so the instruction is relevant for most versions of the software. If you just bought a smartphone or encountered an error "Can't add a fingerprint", the following steps will help solve the problem without contacting the service.
Preparing the smartphone before setting up the fingerprint
Before you add a fingerprint, make sure the device is ready for the procedure. Failure to comply with the basic conditions is the main cause of the failures in the scan.
- 🔋 Battery charge above 20%. At low charge, the system can interrupt the recording process.
- 🧹 Clean sensor. Wipe the power button with a dry wipe -- fat, dust, or moisture distort the scan.
- 🔒 No screen lock, if you have it installed PIN-code or pattern lock, they will need to be entered at the configuration stage.
- 📱 Updated Software. Check firmware relevance in Settings → The phone. → Updating the system.
Also remove the cover or film if they close the power button, even a thin coating can interfere with the correct reading, and if you recently dropped your phone or wet it, the sensor could get damaged, in which case you would need to be diagnosed at the service center.
Step-by-step: how to add a fingerprint
The process of recording a fingerprint on the Poco X3 Pro takes no more than 2 minutes, if you follow the algorithm. Importantly, use the same finger that you will unlock the phone most often (usually this is a large or index).
- Open Settings → Passwords and Security → Fingerprint.
- Enter the current one. PIN-code or pattern lock for confirmation.
- Click on “Add fingerprint” and select your finger (e.g., “Right thumb”).
- Tightly press your finger against the power button and hold until the vibration signals a successful scan.
- Raise your finger and repeat the action from different sides of the pad (edge, center) for full coverage.
- After completing the recording, click "Done".
The system will require at least 6-8 touches to create a full template. If the scanning stage is an error "Too fast" or "Failed scan", slow down the movement and press your finger harder. On the Poco X3 Pro sensor is sensitive to the angle of tilt - you need to hold the phone strictly vertically, without tilting.
Remove the cover/film from the power button |
Wipe the sensor with a dry wipe |
Charge your phone at least 20% |
Make sure your finger is dry and clean |
Prepare. PIN-proof-code-->
Optimizing the scanner: 5 tips
Even after successful setup, the sensor can be unstable, slow to recognize a fingerprint or require multiple attempts, due to the peculiarities of the MIUI algorithms and hardware limitations.
- 🔄 Rewrite the fingerprint. Remove the current pattern and add it again, paying attention to the edges of the finger.
- 🧴 Skin moisturization: If your finger is too dry, moisten it lightly with water or use a cream (but not oily!).
- 📱 Sensor calibration: Resetting security settings (Settings) helps in rare cases → Passwords and security → Resetting the fingerprint settings).
- 🔋 Phone reboot. Sometimes scanner failures are caused by temporary system errors.
- 🛠️ Update of firmware. New versions MIUI Often fix sensor bugs.
If the scanner stopped working after falling or getting moisture, the problem could be hardware, in which case check the sensor's response to touch: pressing the power button should give a slight click, its absence indicates mechanical damage.
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To accelerate unlocking, add the same finger twice at different angles, and the system will recognize it faster.
Common mistakes and their solutions
Poco X3 Pro users often face typical problems when setting up a fingerprint, and we have collected the most common errors and ways to fix them in the table:
| Mistake. | Possible cause | Decision |
|---|---|---|
| "Failure to add a print" | Dirty sensor or wet finger | Wipe the power button and dry your finger. Try again. |
| The scanner doesn't respond to the touch. | Software failure or sensor damage | Reset your phone. If it doesn't work, reset your security settings. |
| The fingerprint is only recognized with 3-5 attempts. | Incomplete scanning of the edges of the finger | Remove the print and add it again, paying attention to the sides of the pad. |
| The sensor only works after restarting. | Conflict with background applications | Clear the system cache in Settings → Memory → Cleanup. |
If none of these things work, check if the sensor is turned off in the developer's settings.
- Activate Developer Mode: Settings → About Phone → MIUI version (click 7 times).
- Back to Settings → Additionally. → For developers.
- Make sure that the option to turn off your fingerprint is turned off.
What to do if the sensor is physically damaged?
Using a fingerprint to authorize applications
The scanner on the Poco X3 Pro supports not only unlocking the screen, but also authorization in banking applications, instant messengers and stores (for example, Google Play, SberBank Online).
- Open your fingerprint settings (Settings → Passwords and Security → Fingerprint).
- Select the item "Authorization in applications".
- Activate the switch for the desired programs.
Important: some applications (such as VTB Online or Tinkoff) require additional configuration in their security settings. Once you activate your fingerprint in the system, go to the application itself and allow the use of biometrics in its settings.
⚠️ Warning: if you reset your phone to the factory, all the fingerprints you saved will be deleted.
Resetting and Deleting Fingerprints: When Needed
Removal of saved prints is necessary in several cases:
- 🔄 Transferring the phone to another user.
- 👆 If the sensor has stopped recognizing the finger after updating the firmware.
- 🔒 If you suspect access of third parties to the device.
To remove the print:
- Go to Settings → Passwords and Security → Fingerprint.
- Select the desired print and click "Delete".
- Confirm the action by entering PIN-code.
To completely reset all biometric data (including facial recognition if it is configured), use the Reset fingerprint settings option in the same menu, which will come in handy if the scanner starts to work incorrectly after installing custom firmware or rooting.
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Removing the fingerprint does not affect other unlocking methods (PIN, pattern lock), but without at least one alternative method (other than biometrics), the system will block access to security settings.
Additional functions: gestures and quick actions
On the Poco X3 Pro, the fingerprint scanner can be used not only to unlock, but also to quickly access functions.
- 📷 Quick camera start: double-press the power button (setting in Settings) → Lock screen → Quick camera launch).
- 🔕 Disconnecting the sound: some firmware supports the gesture “swipe on the sensor” to put the phone in silent mode.
- 🔒 Blocking applications: through Settings → Confidentiality → Blocking applications can prevent access to individual programs without scanning the fingerprint.
These features are not available in all versions of MIUI. If the desired option is not on the menu, check the relevance of the firmware or install an alternative launcher (such as Nova Launcher) that supports gestures.