How to set a fingerprint on Xiaomi Redmi 9A: instructions with photos and tips

Introduction: why you need biometrics on a budget smartphone

The Xiaomi Redmi 9A fingerprint scanner is not just a feature of flagship models, but a real tool for security and convenience. Despite the budget price category, the device supports biometric authentication, which allows you to unlock the screen in a split second, confirm payments to Mi Pay or Google Pay, and protect access to individual applications. However, many users face difficulties in the first setup: the system does not recognize a finger, the sensor is intermittent or there is no option in the menu.

In this article, we will look at all the steps of adding a fingerprint, from preparing a smartphone to solving typical errors, and focus on the nuances associated with the MIUI firmware version and the hardware limitations of the Redmi 9A. For example, did you know that on this device the scanner is located not under the screen, but on the back of the camera?

If you just bought a Redmi 9A or upgraded your firmware but can't find your biometrics settings, don't panic. Maybe it's a resolution that's disabled or an outdated version of MIUI, and we'll go through each scenario in detail.

Device requirements before setting up

Before adding a fingerprint, make sure your Xiaomi Redmi 9A meets the minimum requirements, which will eliminate errors like “failed to add a fingerprint” or “Sensor is not responding.”

• 📱 Version. MIUI: lower MIUI 11 (on older firmware, the scanner may not work properly — MIUI 12.5. MIUI 13.
• 🔋 Battery charge: at least 20%. At low charge, the system blocks the addition of biometric data.
• 🔒 The main way to unlock: must be installed PIN-code, pattern lock or password (minimum 4 characters) without this fingerprint can not be added.
• 🧹 Sensor cleanliness: wipe the scanner with a dry wipe – fat, dust or moisture distorts the reading.

If your smartphone hasn’t been updated in a long time, check the current version of MIUI in the Settings menu → About Phone → MIUI version. To update, go to Settings → System Update and install the latest firmware. On Redmi 9A with factory firmware below MIUI 11, the fingerprint option may be missing completely - this is a hardware limitation that can only be fixed by flashing.

⚠️ Note: If you use unofficial firmware (such as LineageOS or Pixel Experience), the fingerprint scanner may not work at all or may not work at all. MIUI.

Step-by-step: how to add a fingerprint

Now, to the main thing, add a fingerprint, follow the instructions carefully, because skipping even one step can cause a failure.

1. Open the settings (cog icon on the desktop).
2. Go to the Passwords and Security section.
3. Select the Fingerprint option (if not, see the What to do if there is no option).
4. Enter the current one. PIN-proof-code.
5. Press Add Fingerprint.
6. Place your finger on the scanner (on the back of the camera) and wait for the vibrations to occur. Repeat the action by changing the angle of your finger until the scale is 100% full.
7. Set the name of the fingerprint (for example, “Indicative Right”) and save it.

The system will suggest adding a backup unlocking method (e.g. Face Unlock) that is optional, but is recommended for cases where the sensor does not work (e.g., with wet or dirty hands).

Install PIN-code

Update MIUI to the latest version

Clean the scanner of dirt

Charge your phone at least 20%

Make sure your finger is dry-->

If the process is interrupted during the scanning phase, try:

• 🔄 Restart the phone and try again.
• 🧴 Rub your finger and sensor with an alcohol napkin (without fanaticism!).
• 👆 Try the other finger – sometimes the system is better at reading fingerprints from the index or thumb.

Common mistakes and their solutions

Even with the right setup, Redmi 9A users face typical problems, including the most common and how to fix them.

If after several attempts the print is not added, check the operation of the sensor using the engineering menu:

1. Enter the code ##4636## in the Phone app.
2. Choose Equipment Testing.
3. Find the Fingerprint Sensor Test and monitor the sensor response.

⚠️ Attention: If the scanner does not respond to touch in the engineering menu, this may indicate a hardware malfunction. In this case, contact the Xiaomi service center - self-repair of the sensor can damage the plume.

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If the print is not readable in winter, warm your hands before unlocking – the cold reduces the sensitivity of the skin, and the sensor may not recognize the pattern.

How to manage saved prints

Once you add a print, you can edit the name, delete it, or add new ones. Here's how to do it:

• 📝 Rename: Go to Settings → Passwords and security → Fingerprint, click on the desired fingerprint and select Rename.
• ❌ Delete: In the same menu swipe left on the print or click Delete.
• ➕ Add a new one: Click Add Fingerprint and repeat the scanning procedure.

The Redmi 9A can save up to 5 fingerprints (including fingerprints of different users), which is convenient if you want to unlock your phone with both your right and left hand, but remember: the more fingerprints you have, the slower the sensor is at recognition.

If you're handing over your phone to another person, don't forget to delete your fingerprints! PIN-biometric data is stored in a secure chip and is not reset during a normal reboot.

Optimization of the scanner: tips and life hacks

To make the print read from the first touch, follow these tips:

• 🔄 Register the same finger twice at different angles, which will increase the likelihood of recognition.
• 🧴 Use a hand moisturizer if the skin is too dry (but not before a scan!).
• 🔋 Turn off the power saving mode - it can slow down the sensor.
• 🛡️ Set up “Safe Mode” for fingerprints: in Settings → Passwords and security include the option Require PIN reboot.

If the scanner has become worse over time, try resetting the sensor settings:

1. Delete all the fingerprints you saved.
2. Reboot the phone.
3. Add the fingerprints again, holding the finger on the sensor longer (up to 2-3 vibrations per touch).

On the Redmi 9A, the scanner does not support gestures (for example, swiping over the sensor to open the notification curtain), but you can assign a fingerprint to quickly launch applications.

1. Install Fingerprint Quick Action from Google Play.
2. In the application settings, select an action (such as opening a camera or flashlight).
3. Now, double-touching the scanner will perform the selected action.

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The fingerprint sensor on the Redmi 9A doesn't support underscreen scanning -- it only works when you physically touch the back, and it's a hardware platform limitation, and you can't even fix it with firmware.

What to do if the fingerprint option is not on the menu

If there is no item in the security settings to add a fingerprint, the reasons may be as follows:

1. On Redmi 9A with MIUI 10 or lower, the scanner is software disabled. Solution: upgrade to MIUI 12.5+ via Settings → System Update.
2. Regional restrictions: In some regions (e.g. European firmware), the biometrics option is disabled. Solution: change region to India in Settings → Additional → Region (reboot required).
3. Hardware malfunction: If the sensor is physically damaged, the option may be lost. Check its operation in the engineering menu (see section above).
4. Root right or custom firmware. Unofficial builds often break the scanner. Solution: return the stock firmware through the Mi Flash Tool.

If the MIUI update didn’t help, try resetting your phone to factory settings:

1. Make a backup of the data in Settings → Additional → Backup.
2. Go to Settings → About the phone → Reset settings.
3. Select Reset all settings (does not delete files, but resets security settings).

⚠️ Warning: Resetting will delete all saved prints, Wi-Fi passwords and app settings. After the procedure, you will need to reset the phone, including adding a fingerprint.

FAQ: Answers to Frequent Questions