Xiaomi and Redmi have long established themselves as devices with a thoughtful interface and wide functionality, but the issue of personal data security often goes without the proper attention of users. The built-in Notes app allows you to store not only shopping lists, but also important confidential information, such as card numbers, passwords or personal correspondence, which is why the function of blocking an individual application or a specific list becomes critical to maintaining privacy.
MIUI and the new HyperOS have a flexible security mechanism that doesn’t require third-party software, so you can restrict access to your notes with a pattern lock, digital code, or biometrics, which provides a strong barrier for prying eyes, even if your phone is unlocked in the wrong hands.
Next, we will analyze in detail all available methods of protection, nuances of settings in different versions of firmware and answer frequent questions that arise from owners of Xiaomi, Redmi and POCO smartphones.
Preparation for data protection settings
Before you start setting restrictions directly, you need to make sure that your Mi Account is activated and linked to your device, a MIUI security requirement that allows you to restore access to protected data in the event of a reset or loss of password. Without an associated account, some encryption features may not be available.
It is also worth checking whether the Notes app itself has been updated to the latest version through the GetApps store or Google Play. In older versions of the interface, the location of controls may differ, and the lock functionality may not work correctly. It is recommended to choose the type of lock in advance: if you prefer speed, it is better to use a fingerprint, if the maximum reliability is a complex pattern lock.
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Use a unique Mi Account for every device in the family so that cloud backups and security settings don’t get confused between gadgets.
It's important to understand that setting a password on an app is a separate procedure from setting a password on the smartphone lock screen itself.These two layers of protection work independently, although they often use the same biometrics for user convenience. Make sure that the necessary permissions are included in your device's security settings.
Set passwords through the security menu
The main and most reliable way to protect is to use the Application Protection system tool, which blocks access to Notes entirely, requiring authorization at each launch. First, go to the main settings menu of your smartphone. Find the Applications section and select Application Protection.
The system will prompt you to create a password for protection, it can be a pattern lock, a 4-digit or a 6-digit numeric code. Attention: this password will be used for all secure applications, so choose a combination that is difficult to guess but easy to reproduce. After creating a password, the system will ask you to link your Mi Account for recovery.
Once you set the common password, you'll be presented with a list of all the programs you've installed, and you'll find the Notes list and activate the switch in front of them, and from that point on, when you try to open the application, you'll see a password entry window or a fingerprint request.
☑️ Setting up application protection
Some firmware versions may have slightly different paths: Settings → Passwords & Security → Application Protection. If you can't find this item, search for settings by typing in "Protection." This is a universal method that works on all models from Redmi Note to flagship Mis.
Blocking individual notes within the application
If you don't have to hide all your records, but only want to protect specific lists, the standard Notes app offers a hidden note feature, a more flexible approach that allows you to keep shared lists visible and sensitive data hidden in a separate container. To access this feature, open the app and click on the three dots in the upper right corner of the screen.
In the drop-down menu, select Hidden Notes. When you first use it, the system will ask you to create a separate password for this category or use an existing application protection password. Once you enter the code, a special repository will open where you can move important entries.
To hide a note, open it, click on the menu (three dots) and select Hide. Now it is only accessible through a special sign in the hidden notes section, which creates an additional level of privacy, because an outsider who even gained access to the phone may not be aware of the existence of such a section.
⚠️ Note: Hidden notes do not sync with the Mi Cloud in normal mode, unless a special encryption option is enabled.When you reset your phone to factory settings without prior unlocking and exporting, the data in the hidden partition can be lost irretrievably.
To move a note back to the public, go to the hidden notes section, select the entry you want, open the menu, and click Remove from the hidden ones. This process is reversible and takes only a few seconds, and the convenience of the method is that you don't have to enter a password every time to view the usual to-do lists.
Using biometrics for quick access
Constantly entering a password can be annoying, especially if you access notes several times a day. Xiaomi’s modern smartphones allow you to replace tedious code entry with the use of biometric data. This is not only faster, but also safer, since your finger or face can not be peeked from the side.
To set up, go to Settings → Passwords & Security → Application Protection. Make sure that the protection for Notes is on. Then click on the gear icon in the upper right corner of the screen (protection settings). Here you will see the option Unlock with your fingerprint or Unlock on your face.
Activate the desired option. The system may ask you to confirm the action with your primary password protection. After that, when you try to open protected notes, the smartphone will instantly scan your finger or face. If the biometrics are not recognized (for example, wet hands), the system will automatically prompt you to enter the password.
| Protection method | Speed of access | Level of security | Convenience |
|---|---|---|---|
| pattern lock | Medium | High-pitched | Average. |
| Cyphrine PIN | Tall. | Medium. | High. |
| Fingerprint. | Instant. | Very tall. | Maximum. |
| Face ID (2D/3D) | Instant. | Medium/High | Maximum. |
It is important to note that budgetary models with 2D-Face scanner unlocking may be less reliable in bright sunlight or in complete darkness (if there is no infrared backlight). In such cases, fingerprint scanner built into the screen or power button is the most stable and versatile solution for owners of Xiaomi devices.
Access settings in different versions of MIUI and HyperOS
The MIUI shell interface is constantly evolving, and depending on the version (Global, China, EEA) or the HyperOS transition, the location of some points may change. Users often find that on one phone the feature is in one place and on another - in another place.
With the current HyperOS, the logic of the work remained the same, but the visual design of the menu has become more minimalist. The Settings path → Applications → Application protection remains basic. However, new versions have the ability to adjust the autolock time: immediately after leaving the application or after 1 minute of downtime.
For Chinese firmware (CN ROM) owners, the interface may be entirely in Chinese, so look for characters that match the word "Security" (usually green shield) or use a screen translator. The menu structure in Chinese versions is often more advanced and contains additional encryption features.
What to do if there is no “Application Protection” clause?
If you upgrade from MIUI 12 to MIUI 14 or HyperOS and your settings are lost, it is recommended to recheck the list of protected applications. Sometimes after a major system update, the protection switches may be reset to the “off” position for compatibility.
Restoring access and solving problems
The most common problem is a forgotten password. If you have a complex combination and don't remember it, the only way to log in is to log in to the Mi Account account you linked when you first set up. On the password input screen, click Forgot your password? and follow the reset instructions via SMS or email.
It's important to understand the difference between an application protection password and an account password. Resetting your application protection password through an account won't delete your information in your notes, it will only allow you to set a new access code. However, if you haven't linked an account, it won't be possible to restore access to your protected notes using software methods.
⚠️ Warning: Attempting to repeatedly enter the wrong password can lead to a temporary lock function or a requirement of waiting for 30 seconds, 5 minutes or even an hour.
In the event of a total system failure or loss of an account, the only radical method is a complete reset of the device to the factory settings (Hard Reset), which will delete all data from the phone, including photos, contacts and, unfortunately, secure notes, if they were not synchronized with the cloud in an unencrypted form.
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Linking a Mi Account at the time of setting a password is the only guaranteed way to restore access to data without losing it in the future.