Smartphones contain a huge amount of personal information, from instant messaging to photos and banking apps. The popular POCO X3 Pro often wonders how to restrict access to specific programs without blocking the entire screen of the device. The built-in MIUI shell offers powerful privacy protection tools that do not require the installation of third-party software.
Unlike many other Android smartphones, Xiaomi’s system has a native application lock feature hidden in standard security settings, which allows you to set a separate PIN or graphical key that will be requested each time you run a selected program, an approach that provides a double layer of protection: sharing your phone and personal access to sensitive data.
The setup procedure is quite simple, but the shell interface can vary depending on the firmware version. In this article, we will discuss all the steps necessary to activate the protection, as well as additional features, such as hiding the content of notifications. The security of your data begins with the correct configuration of the system.
Preparation for system security setting
Before you start installing the locker directly, you need to make sure that your Mi Account is activated and linked to the device, a requirement dictated by the company's security policy, since in the case of a forgotten password, access can only be restored through the linked account, and if you ignore this step, you risk losing access to your applications forever.
It’s also worth checking the current version of the operating system. Xiaomi developers regularly release updates that can change the menu layout or add new protection features. Go to the settings and make sure your software is up to date so that the interface matches the steps described.
It's important to come up with a strong access code beforehand. A pattern lock or digital password doesn't have to be obvious, like "1234" or a simple geometric pattern. Remember, this code will be the only barrier between outsiders and your personal data inside secure applications.
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Use a combination of numbers and complex movements for the pattern lock so that it cannot be peeked or guessed from the tracks on the screen.
Search and activate the application blocking function
The main access control tool is in the system application Security, which is preinstalled on every POCO X3 Pro device. The icon of this application is usually green and has the shape of a shield. This is where all the important tools for optimizing and protecting the smartphone are concentrated.
After you start the app, scroll down to the Tools or Additional section. In the list of available utilities, you need to find an item called Application Protection (or App Lock in English), clicking on this item will trigger the initial lock mechanism setup.
The system will prompt you to create a new password. You can choose between a pattern lock, a digital code or a mixed password. Attention: this password will be used solely to unlock applications, it may be different from the password to unlock the screen of a smartphone, although for convenience, many users set the same combinations.
- 🔒 Select the type of password: graphic, digital or mixed.
- 📱 Find a unique combination that is hard to guess.
- 🔗 Link your Mi Account to restore access.
- ⏱ Set up an automatic lock timer (immediately or after 1 minute).
Configure access and content hiding parameters
Once you set your password, you'll see a list of all the apps you've installed on your smartphone, and you can choose those apps that require increased security, and users typically block access to WhatsApp, Telegram, gallery, contacts, and banking apps.
The feature that is particularly noteworthy is the notification content concealment function, which, if activated for a specific application, even when the smartphone screen is unlocked, the text of the incoming message will not be visible in the notification curtain. Instead of text, you will see only a notification that the application is blocked and requires you to enter a password to view.
You can also set the settings to “Block After” and this setting determines when the application should request the password again, either immediately after leaving it or after a certain downtime. For maximum security, you should choose the option “Immediately” or “In 1 minute”.
⚠️ Note: If you enable concealment of notification content, you will not be able to quickly respond to a message or see the confirmation code from the notification. SMS, This can be uncomfortable in situations where a prompt response is required.
☑️ Checking security settings
Using biometrics for quick access
Entering a password can be tedious every time, especially if you often have to open secure apps. Fortunately, the POCO X3 Pro features a fingerprint scanner built into the on button, allowing you to use biometrics to authenticate.
To activate this feature, go to the application protection settings and find the "Use fingerprint" section. Once this option is enabled, the system will request biometric data instead of entering a pattern lock or numbers, which greatly speeds up the access process and increases the level of comfort of use.
It’s worth noting that biometric unlocking only works for apps that have already been added to the list of protected apps. If you add a new app to the list later, you don’t have to re-set the print, the feature will apply automatically to the entire list.
Some versions of firmware also have facial unlock, but it is considered less secure than a fingerprint scanner because it can be fooled by a photo. For critical data such as banking applications, it is better to rely on a fingerprint or a strong password.
What to do if the scanner is not working?
Comparison of data protection methods in MIUI
The MIUI shell offers several layers of protection, and it's important to understand the difference between them to choose the most suitable one for your needs.Application locking is just one tool that is often confused with other security features.
Below is a table comparing the basic security techniques available on the Xiaomi POCO X3 Pro. It will help you understand when to use app lock and when to use other tools like Second Space or encryption.
| Protection method | Level of access | Difficulty bypassing | Impact on productivity |
|---|---|---|---|
| Application lockdown | Individual programmes | Medium. | Minimum |
| Second space | Complete copy of the system | High-pitched | Average (consuming resources) |
| Hidden album | Photos and videos only | Medium. | Minor. |
| Encryption of the telephone | All device data | Very tall. | Minimum |
As you can see from the table, app locking is the most flexible tool for everyday use. It doesn't create an isolated environment like Second Space, but it effectively hides access to specific data from random glances or children.
Restoring access and solving problems
It is not uncommon for a user to forget a password or change a graphical key and then fail to play it. MIUI has a recovery mechanism, but it requires prior preparation, which is why linking a Mi Account account was described as a critical step at the beginning of the article.
If you forget your password, the "Forgot Password" button will be available on the input screen, and clicking on it will trigger the recovery procedure via SMS to the associated number or through the Mi Account login. Without this step, it will be almost impossible to reset the password to the applications without losing data.
In some cases, users encounter bugs when an application stops asking for a password or, conversely, requests it constantly, even when the timer is set to a high value, in such situations, cleaning the data of the Security application itself or updating the system to the latest version helps.
⚠️ Warning: Resetting your phone to a factory setting will delete all data, including app lock passwords, but also destroy all your photos, contacts and files.
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The forgotten password from blocking apps can only be restored through the Mi Account or phone number linked, so never ignore the binding step when you first set up.