Smartphone owners Xiaomi Redmi 9A often face the need to hide personal correspondence, banking applications or photo galleries from prying eyes. The built-in MIUI shell offers powerful tools for local data protection without installing third-party apps. This is especially true if the device is used by children or colleagues, and you want to maintain the confidentiality of your files.
The process of activating the lock has been simplified as much as possible by the developers, but has its own nuances depending on the firmware version. You don't need to be an IT specialist to set up a strong barrier for curious users. In this guide, we'll go through each step in detail to ensure maximum security for your device.
Preparing your security system
Before you start blocking specific apps, you need to configure the overall level of protection for your device. The basic element is setting pattern key or a digital PIN code. Without this step, the application protection function will remain inactive, since the system has a standard for comparison when unlocking.
Go to the main settings of your Redmi 9A and find the section responsible for passwords and security. Here you will see the option to create a new type of screen lock. The system will offer to choose between a pattern, a digital code or a mixed option. Pattern key is often considered more convenient for frequent use.
⚠️ Attention: Remember the created password or write it down in a safe place. If you forget the access code, data recovery may require a complete reset of the smartphone to its factory state.
It is also recommended to link your Mi account at this stage. This will allow you to restore access to your privacy settings if you lose your password through Xiaomi cloud storage services. Make sure that the Internet connection is stable when performing this procedure.
Activating the “Application Protection” function
After setting the basic screen password, we proceed to directly setting up restrictions for the software. In the security menu, find the item called Application protection. This tool is the central hub for controlling access to installed apps on your device.
When you first log in, the system will ask you to create a separate password specifically for this function. It may be the same as your screen unlock password, but for increased security, experts recommend using a unique code. Enter it twice to confirm and, if desired, set up a security question.
⚠️ Attention: The menu interface may vary slightly depending on the MIUI version. If you do not find an item in the security section, try searching through settings by entering the query “Protection.”
After confirming the password, you will see a list of all applications installed on your smartphone. Here you can select which apps will require authorization when launched. Switch the sliders next to the desired icons to activate the protection mode for them.
☑️ Check before activation
Setting up biometric unlocking
Entering a password every time you open the messenger can become a tedious task. Fortunately, Redmi 9A equipped with a fingerprint scanner located on the back of the case. Using biometrics significantly speeds up the process of accessing protected data.
To activate this function, go to the application protection settings and find the “Fingerprint unlock” item. The system will prompt you to add a new fingerprint or use an existing one if you previously set it up to unlock the screen. Follow the instructions on the display to calibrate the sensor.
Now, when you try to open a locked application, you just need to put your finger on the scanner. If the fingerprint is not read for any reason, the system will automatically prompt you to enter the previously installed one pattern key. This is a reliable double authentication mechanism.
For best scanner performance, keep your finger and sensor clean. Oily marks or moisture may make fingerprint recognition difficult.
Hide notification content
Even if the application is password protected, the text of an incoming message may appear on the lock screen or in the notification shade. To completely hide the fact that you received a message, you need to configure additional privacy settings in the same menu.
In the security settings section, find the “Hide Contents” option. Activating this switch will replace the notification text with a standard phrase like “New notification” or hide it completely until the phone is unlocked. This prevents information from leaking through the lock screen.
This feature is especially useful for social networks and email clients. You will know about the new letter only after you unlock the device yourself and enter the password. No one around you will be able to read the message preview by accident.
Using Second Space
For those who need radical data isolation, MIUI provides the “Second Space” function. This is not just a password for an application, but actually creating a second smartphone inside one device with a separate set of apps and files.
The transition between spaces is carried out with a special fingerprint or password. You can configure it so that one finger opens the main workspace, and the other opens the private one, where all personal data is hidden. This is an ideal option for separating work and rest.
To enable this feature, go to Settings → Second Space and follow the setup wizard. You will need to allocate a little extra memory for the second environment. After the setup is complete, you will have two independent desktops.
Differences between Second Space and simple protection
Second Space creates a completely isolated environment with separate contacts, photos and applications, while application protection simply puts a lock on the entrance to a specific app, leaving files accessible through the file manager.
Comparison of data protection methods
The choice of protection method depends on what level of confidentiality you need. Simple application blocking is suitable for quick protection from children, while Second Space guarantees complete data isolation even from advanced users.
The table below compares the main characteristics of various methods of restricting access to Redmi 9A. This will help you decide on the optimal security strategy for your needs.
| Protection method | Difficulty level | Access speed | Reliability |
|---|---|---|---|
| Application protection | Low | High | Medium |
| Second space | High | Medium | High |
| Hide files | Medium | Low | High |
| Guest mode | Low | High | Low |
Please note that using Second space may slightly increase RAM consumption, since the system has to support two active user profiles simultaneously. On budget models, this is worth taking into account.
⚠️ Attention: Functions and names of menu items may change after major MIUI firmware updates. If the described paths do not match, check the current documentation in the device help.
Frequently asked questions and solutions to problems
During the setup process, users often encounter typical questions regarding restoring access or running a function in the background. Below are answers to the most popular queries.
What should I do if I forgot my application protection password?
Click on the “Forgot password” button on the input screen. The system will prompt you to answer the security question that you asked during setup, or send a confirmation code to your linked Mi account. If these methods are not available, you will need to reset the settings.
Is it possible to bypass protection through safe mode?
No, the application protection function is built into the system level of the MIUI shell and continues to work even in safe mode. Third-party applications are blocked, but system restrictions remain active.
Why does the application not ask for a password after a reboot?
Check the settings in the “Application protection” section. Make sure the "Block when exiting application" option is enabled. If it is disabled, the password is requested only once after turning on the phone.
Does application protection affect the operation of notifications?
The protection itself does not disable notifications, but if the option to hide content is enabled, you will not see the message text until it is unlocked. Sound and vibration will operate as normal.
The integrated use of application protection and biometrics provides an optimal balance between data security and the convenience of everyday use of the smartphone.