How to set up a fingerprint on Xiaomi Mi A2 Lite: a complete guide with tips for bug fixing

Why do you need to set up a fingerprint on Xiaomi Mi A2 Lite?

Fingerprint scanner on Xiaomi Mi A2 Lite is not just a convenient way to unlock, but also an additional level of protection of personal data. PIN-In the case of code, biometric authentication eliminates the risk of passwords being matched by third parties, but many users face problems: the sensor does not recognize the fingerprint, it does not work with a delay or does not respond to touch at all. Most often this is due to improper settings, sensor contamination or software failures.

In this article, you will find step-by-step instructions for adding, deleting and optimizing fingerprints, as well as solving common errors. Particular attention is paid to the nuances specific to the Mi A2 Lite, a model with a rear-mounted scanner and specific firmware based on Android One. If you just purchased a device or experienced problems after an update, this information will help return the functionality of the sensor without going to the service center.

Before you start setting up, make sure that your smartphone has the latest firmware version installed. For the Mi A2 Lite, it is critical to upgrade to Android 10 (or later), since earlier versions have been detected bugs with the scanner. You can check the current version in the Settings menu → About Phone → Android version.

Preparing the smartphone before setting up the fingerprint

Before you add a fingerprint, you need to do a few preparatory steps, which minimizes the risk of failure and ensures that the sensor works correctly.

First, clean the scanner of contaminants. The sensor on the Mi A2 Lite is located on the back and often gets dirty from contact with surfaces or fat marks. Use soft lilaless fabric soaked in an alcohol solution (at least 70%). Avoid abrasive materials - they can damage the protective coating of the sensor.

Second, make sure that the phone is installed. PIN-It's a prerequisite for activating biometric authentication, and if the security is not configured, the system will prompt you to create it before adding a fingerprint — PIN 6+ numbers, as it is more reliable than the pattern lock.

• 🔄 Reboot the device before setting up – this will reset temporary system errors.
• 📱 Make sure the battery is above 20%.At low charge, some safety features may be limited.
• 🚫 Turn off the power saving mode in the settings, as it can block the sensor operation.

⚠️ Note: If you have previously installed custom firmware or obtained root rights, the fingerprint scanner may not work properly.

Step-by-step: how to add a fingerprint

The process of adding a fingerprint to the Xiaomi Mi A2 Lite is intuitive, but has a few nuances. Follow the instructions carefully to avoid recognition errors.

1. Open Settings and go to System → Security → Fingerprint.
2. Enter the current one. PIN-code or pattern lock to verify identity.
3. Press Add Fingerprint and follow the prompts on the screen. The system will prompt you to apply your finger to the scanner several times at different angles.
4. After a successful scan, assign a name to the fingerprint (e.g., "Indicative Right") and save the changes.

Important: during the scan, don't press too hard on the sensor, it can distort the reading. Optimal pressure is a light touch with a pad of your finger. If the process is interrupted, start again, because the partially stored print will not work.

You can add up to 5 fingerprints to the Mi A2 Lite, which is convenient if you want to use different fingers to unlock or give access to a trusted person, but remember, the more fingerprints you save, the slower the scanner can work when it recognizes.

Make sure the scanner is clean.|Turn off the power saving mode|Check the battery charge (>20%)|Install PIN-code-->

How to Remove or Rename an Imprint

If the print is no longer recognized or you want to replace it with a new one, you can delete it or edit it.

1. Go to Settings → System → Security → Fingerprint.
2. Enter. PIN-proof-code.
3. Click on the name of the fingerprint you want to change.
4. Choose Remove or Rename (Pencil icon).

Removing the fingerprint doesn't affect other stored data, but it does require reconfiguration if you want to use it again. If you delete all the fingerprints, the system automatically disables biometric unlocking, and you have to enter it. PIN-code.

⚠️ Note: Some of the Mi's firmware A2 Lite may reset the automatic unlock setting (for example, for applications or payments) after the last fingerprint is deleted.

If you want to replace a fingerprint, delete the old one first, then add a new one. Don't store duplicate fingerprints of one finger, which can cause recognition conflicts.

Common mistakes and their solutions

Even after setting up correctly, the fingerprint scanner on the Xiaomi Mi A2 Lite may not work properly.

If none of these methods worked, try resetting your security settings.

1. Go to Settings → System → Resetting Settings → Resetting security settings.
2. Confirm the action. PIN-code.
3. After restarting, add the print again.

On the Mi A2 Lite with firmware below Android 9, the fingerprint scanner may not work in third-party applications (Sberbank, Tinkoff).

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If the scanner stopped working after the phone fell, check the integrity of the back panel. Even microcracks near the sensor can disrupt its operation.

Optimization of the scanner: tips and life hacks

To make the fingerprint scanner on Xiaomi Mi A2 Lite work quickly and without failure, follow these recommendations:

• 🔋 Update your firmware regularly. Newer versions of Android fix recognition errors.
• 🧴 Avoid hand creams before using the scanner – they create a film that impairs reading.
• 📵 Do not cover the sensor with magnet cases or metal accessories.
• 🔄 If the scanner is “hang”, force the phone to restart (clip the power). + Increase volume by 10 seconds).

To speed up recognition, you can turn off the unlock animation:

1. Activate Developer Mode (7 times click on Build Number in Settings → About Phone).
2. Go to Settings → System → For developers.
3. Find the parameters Windows animation, transition animation and Animator Duration - set the value Disconnected.

If you use a fingerprint to automatically unlock applications (like WhatsApp or the Gallery), check the settings of a particular application. Some programs require separate biometrics settings in their security settings.

Security: How to protect data when using a fingerprint

While a fingerprint is convenient, it's not a complete protection, and here's how to minimize the risks:

• 🔒 Don't use a print as the only method of unlocking. Always set up a backup. PIN-code.
• 🚨 Turn off unlock in your pocket (Settings) → Display. → Unlock in your pocket to avoid accidental touch.
• 📱 Do not add fingerprints of strangers, even temporarily.

On the Mi A2 Lite, prints are stored in a secure area of the chip and not transmitted to the cloud, but when you unlock root or install custom firmware, this protection can be compromised. If you have modified the system, it is recommended that you disable biometric authentication for financial applications.

For additional security, set up two-step authentication in mission-critical applications (banks, instant messengers). For example, in Google Account you can link a fingerprint. + SMS-code.

⚠️ Note: If you sell or transfer a phone, be sure to remove all fingerprints through Settings → Security: Even after resetting to factory settings, some biometrics may be stored.

FAQ: Answers to Frequent Questions

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On the Xiaomi Mi A2 Lite, the fingerprint scanner is sensitive to humidity. If the sensor doesn't recognize your finger after showering or in wet weather, wipe it and try again.