The return of the standard theme to Xiaomi Mi 9: the complete guide

Smartphone Xiaomi Mi 9, released in 2019, still remains a popular device due to its powerful processor and high-quality AMOLED-However, users often experiment with the appearance of the system by installing third-party themes from the directory. MIUI Themes or downloading modified design packages from unverified sources, sometimes such experiments cause the interface to become unstable, icons stop showing correctly, and system fonts turn into unreadable characters.

In these situations, there is an urgent need to get everything back to factory status. The standard theme is not just a set of pictures, it is the basic layer of the MIUI interface that ensures that system applications, notification curtains and settings menu work correctly, and if this layer is damaged or replaced by an incorrect file, the phone can run slowly or even freeze when trying to open certain partitions.

In this article, we will take a look at all the available ways to recover defaults. You will learn how to use the system’s built-in tools to reset, how to forcely delete problematic files through the recovery menu, and what to do if standard methods don’t work. It is critical to understand that resetting the theme does not delete your personal data, but can change the location of widgets on your desktop. Follow the instructions carefully to avoid errors.

Why is the design lost and how it affects the MIUI

MIUI is deeply integrated with Android system services, so replacing graphics often affects not only the look but also functionality. When you install a third-party theme, it may contain errors in the XML code that conflict with the current firmware version. For example, the theme for Android 9 may not work properly on Android 10, causing malfunctions in the rendering of controls.

Often, users are faced with a situation where after installing a new theme, the phone starts to work slower, this is due to the fact that heavy graphics or unoptimized animations consume more CPU and RAM resources. In some cases, the system can cyclically restart the SystemUI process, which leads to constant flashing of the screen or a complete freeze of the device.

⚠️ Warning: Installing topics from unknown sources may contain malicious code that not only changes the look but also steals data. Always check author ratings and reviews before downloading.

In addition, some themes can change the system fonts to those that do not support Cyrillic or special characters, resulting in the settings menu or messages instead of text, squares or characters, which makes navigation on the phone almost impossible, since you can not read the names of menu items, in such cases, returning a standard theme is the only way to return the device to working condition without full flashing.

Also worth noting is the impact of the theme cache: With frequent change of designs in the device memory, remnants of old files accumulate, which can conflict with new installations, which leads to the fact that even after choosing a "standard" theme in the settings, some elements can remain from the previous design, creating visual chaos. Clearing the cache and completely resetting the theme parameters solve this problem.

Standard method of return through the Topics app

The easiest and safest way to get back to factory design is to use the built-in Themes app, which is suitable for most cases where the system is stable and you can get into the settings menu. First of all, you need to open the Themes app on the home screen or in the tool folder.

When you start the app, go to the user profile, which is usually the person icon in the top right corner of the screen, and it stores your entire download and activation history, and find the My Themes or My Themes section, and you should see a theme in the package list that's called "Classic," "Default," or "Standard," which is usually labeled with a factory icon or a standard MIUI icon.

Click on the standard theme you select and click Apply at the bottom of the screen. The system will warn you that the standard lock and desktop style will be applied. Confirm the action. After that, the screen will go out for a few seconds and the phone will return to its factory appearance. However, sometimes this is not enough, as there may be tails from previous settings.

To completely reset, it is also recommended to clear the Topic app itself. Go to Settings → Apps → All Apps, search for Topics in the Topic list. In the menu that opens, select Clean and then Clean everything. This action will delete the cache and temporary files associated with the themes, but will not affect your personal photos or contacts. After this procedure, the phone can restart and the interface will be completely clean.

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Before resetting the theme, take screenshots of the location of your widgets, as once back to the standard, they may shift or disappear from desktops.

Forced reset via Recovery menu

If the system interface is so damaged that you can't open the settings or the Theme app, you'll have to use a more radical method, resetting the Recovery menu, which allows you to do deep cleaning of system partitions, including the design settings, without having to download the main interface.

To enter recovery mode on the Xiaomi Mi 9, you need to turn the device off completely. Then press the volume button and the power button at the same time. Hold them until the Mi logo appears, then release the power button, but continue to keep the volume until the Recovery menu appears. The navigation here is done by the volume buttons, and the choice is by the power button.

From the Recovery menu, select a language (if available), then go to Wipe Data. Here, it is important to choose the Wipe All Data option if you are ready to lose all data, or Wipe Theme Data (if such an option is available in your version of Recovery, which is rare). In most cases, a complete reset is required to completely remove traces of the topic. Confirm the action by entering the word "yes" or selecting Confirm.

⚠️ WARNING: Wipe All Data will delete all your photos, contacts, and apps, and only use this method if other methods have failed and you have a backup.

Once the cleaning process is complete, select Reboot and then Reboot to System. The phone will reboot as new, with a factory theme and settings. This is guaranteed to remove any interface modifications that may have caused the crashes. This method also helps if the phone gets into a cyclical reboot due to a conflicting theme.

Remove Third-Party Themes Through File Manager

Sometimes the problem is a specific theme file that is left in memory and automatically used when you download it, in which case you can try to remove it manually through the built-in Explorer. Open the File Manager app and go to the device's internal memory.

You need to find a folder called MIUI, then go to theme subfolder. This is where all the downloaded and installed themes are stored. The files are usually.mtz extension or are located in the current folder. Find a file that matches the name of the problem theme, or simply delete the contents of the folder that is responsible for the cache of the current theme.

Also worth checking is the Android/data/com.android.thememanager folder. Inside may be temporary files that block the return to the standard. Deleting the contents of this folder is safe for the system, since it is only the app cache. After deleting the files, force the Themes app to close through the menu of working applications and try again to choose the standard design.

If the standard file manager can't see system folders due to Android 10/11 limitations, you may need to connect to your computer via USB. In file transfer mode (MTP), you'll get more access to directories. Find the /MIUI/theme/ path and clear it. After you turn off the cable, restart your smartphone.

Using ADB to Deeply Clean Theme Settings

For advanced users who want to avoid full flashing but have access to a computer, Android Debug Bridge (ADB) is a great tool.This method allows you to delete specific theme packets or reset settings through the command line, even if the phone screen is partially unresponsive. You will need to install ADB drivers on your PC and enable USB debugging on your phone.

Connect the Xiaomi Mi 9 to your computer with a USB cable. Open the command line on your PC in the ADB folder and enter the command to check the connection: adb devices. If the device appears in the list, you can move to remove problematic components. Often the culprit is a third-party theme package that takes priority over the system.

adb shell pm uninstall -k --user 0 com.miui.theme

This command will remove updates or modifications to the TEM app, returning it to the factory version, which often resets the design settings. If you know the exact name of the installed theme package (you can find it through apps like App Inspector), you can delete it using the adb uninstall command. package_name.

You can also try to reset the settings through ADB without removing applications. adb shell settings put global theme_config_default 0 (The parameters may vary depending on the version MIUI) You can force the configuration to default. After you execute the commands, be sure to reboot the device with the adb reboot command.

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Using ADB is the most accurate way to remove specific conflicting components without losing personal data, but requires caution and accuracy in command input.

Comparison of recovery methods and table of solutions

The choice of method depends on the current state of your device. If the phone turns on and works, but just "gluts" the interface, a standard reset is enough. If the system does not load to the end, you will have to use Recovery. Below is a table that will help you quickly determine the action.

It is important to understand that the Xiaomi Mi 9 has enough powerful hardware to cope with heavy topics, but MIUI optimization sometimes fails with deep customization. If none of the methods worked, the system partition may be damaged, and you will need to flash the device through the Mi Flash Tool. However, in 95% of cases, the return of a standard theme is solved by the methods described above.

After a successful return to factory design, it is recommended that you do not install new themes for a while to ensure the stability of the system. It is also worth checking for firmware updates in the Settings → About Phone section, as newer versions of MIUI often fix theme compatibility bugs.

Frequently Asked Questions (FAQ)