How to set up fingerprint unlock on Xiaomi Redmi 9

Modern smartphones offer many ways to protect personal data, but biometrics remains the most convenient and quick option. Xiaomi Redmi 9 owners often wonder how to activate this feature so as not to enter a pin code every time.

The sensor built into the back cover is fast enough, but it requires the right initial calibration to work properly. If you just bought the device or reset the settings to the factory, the system will offer you several protection methods, and we will discuss why you should choose a finger scan and how to make this process as efficient as possible for everyday use.

Scan errors can occur due to improper hand positioning or sensor contamination. To avoid situations where the phone does not recognize the owner, you need to perform the procedure of recording fingerprints as efficiently as possible. In this guide, we will describe in detail each step that will help you adjust biometric protection without unnecessary difficulties.

Preparing a smartphone for setting up biometrics

Before you go directly to the scan, make sure your device is ready to work with system security features.On Redmi 9 running shell-controlled MIUI, To activate fingerprinting must be set a digital password, pattern lock or complex PIN-This is a security requirement of Android that cannot be circumvented, as the fingerprint is only a convenient addition, not a complete replacement of the main password.

It is also worth checking the cleanness of the sensor surface located on the back of the device next to the camera module. Fat spots, dust or moisture can significantly reduce the recognition speed and lead to read errors. Wipe the scanner area with soft dry cloth to ensure perfect contact with the finger pad during the recording procedure.

⚠️ Warning: Do not try to set up the unlock with wet or dirty hands, as this will lead to the preservation of an incorrect print sample, which will later be difficult to use.

Make sure the battery is strong enough to adjust, although the process does not require much energy. If the smartphone screen is broken or has severe damage in the display area, this can prevent the display of system windows, but the work of the rear scanner is usually not affected, the main thing is that the touchscreen responds to the clicks to navigate the settings menu.

Step-by-step instructions for activating the scanner

The process of adding a new fingerprint to Xiaomi Redmi 9 is standardized and takes no more than two minutes of your time. First, unlock the device and find the Settings icon on your desktop that looks like a gear, then you will need to go to the Passwords and Security section, where all the data protection tools are concentrated.

From the menu that opens, select Unlock by Fingerprint. The system may request you to enter your current password or graphical key to confirm access rights. After successful authorization, click the large Add fingerprint button, which will trigger the setup wizard.

Then follow the instructions on the screen, putting your finger on the sensor in different areas. Don't hold your finger statically, but constantly change the angle of inclination so that the system counts the edges and center of the pad. After the first stage, the system will suggest adding a second fingerprint, which is highly recommended for ease of use with one hand.

• 👍 Put your finger on the sensor with a plane rather than the tip.
• 👍 Change the angle of your finger with each application.
• 👍 Don’t press your finger too hard, just a light touch.
• 👍 Repeat the procedure for the thumb of the second hand.

Advanced settings and fingerprint management

Once you've successfully recorded one or more fingerprints, the management menu becomes available for editing. In the Fingerprint Management list, you'll see entries with names like "Fingerprint 1" or "Fingerprint 2." Click on the name to rename it, such as "Right Big" or "Left Index", which will make it easier to understand which finger is recorded.

In the same section, you can delete unnecessary data. If you are selling a phone or just want to delete an old fingerprint, select the corresponding entry and click Delete. This action is irreversible, and you will need to enter the main security password of the device again to confirm.

Also on the fingerprint settings menu is often the option to use fingerprinting to authorize apps and payment systems, make sure the device unlock switch is active, and check the settings for Google Pay or banking apps if they require separate activation within the programs themselves.

Using a fingerprint to protect applications

One of the useful features of MIUI is the ability to hide the contents of individual applications for additional biometric verification, which does not replace unlocking the smartphone itself, but creates a second barrier for prying eyes when the phone is already unlocked, a feature that is extremely useful for instant messengers, gallery or bank customers.

To activate this protection, go back to the Passwords and Security menu and select Application Protection. The system will suggest you create a separate privacy password if you haven't already. After setting the password, turn on switches opposite the programs that should be restricted.

When you try to open a secure application, the system will ask you to attach a finger, if the fingerprint does not match or if you use a finger that is not added to the system, access will be denied, which creates a reliable level of privacy for your personal correspondence and photos.

Solution: If the scanner is not working

Sometimes users are faced with a situation where the scanner that was previously working stops responding or often starts to make mistakes. First of all, check if there is a protective film on the back panel that covers the sensor. Even a thin layer of plastic can distort the signal, especially if the film is thick or has a texture.

If there are no mechanical obstacles, try restarting your device. Android may have temporary driver crashes that can be fixed by simply restarting your system, and it’s also worth checking for firmware updates in the About Phone section, as manufacturers often release patches that improve sensor performance.

⚠️ Warning: If the scanner stopped working after the phone fell or moisture got in, the problem could be hardware, in which case the software methods won't help, and you'll need a diagnosis at the service center.

If the phone sees a finger but unlocks slowly, try removing the old fingerprint and writing it back down, paying more attention to the edges of the pillow. Sometimes writing the same finger twice under different names will increase the likelihood of successful recognition the first time.

Tips for improving recognition accuracy

For owners of Xiaomi Redmi 9, it is important to know a few nuances that will make using the scanner more comfortable. First, try not to change the angle of grabbing the phone radically: if you recorded a fingerprint with your right hand, then it is better to unlock it in a similar position.

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Write down the same finger twice: this will take up a little space in memory, but will significantly improve the speed and reliability of unlocking in different lighting conditions and hand position.

Secondly, consider the skin condition, if you have dry skin, the scanner may work worse, so you can slightly moisten your finger with your breath before you put it on the sensor, and vice versa, if your hands are sweaty, you should wipe them before using the safety feature.

• 👍 Use the side of your finger to write if the main phalanx is not readable well.
• 👍 Regularly wipe the back panel of the smartphone from fat.
• 👍 Update your prints every few months if you notice a slowdown.

Remember, the optical scanner in this model is sensitive to bright light, and if you're trying to unlock your phone in direct sunlight, the sensor might go blind, and in these situations, you'd better use a screen face or a password.

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The unlock quality of 90% depends on how varied the finger angles were during the initial setup, not the pressure strength.