Why Xiaomi Redmi 9 is constantly reset wallpaper – a full analysis of the causes and solutions

You installed beautiful wallpaper on your Xiaomi Redmi 9, but after a reboot or system update, they changed back to standard? This problem is familiar to many owners of smartphones on MIUI, Xiaomi's branded shell. Unlike "bare" Android, where the wallpaper is stable, MIUI sometimes behaves unpredictable: it resets the background of the desktop, then returns the standard theme after the update.

In this article, we’ll break down 7 main reasons why Redmi 9 wallpapers are self-resetting, from firmware bugs to memory optimizer conflicts, learn how to diagnose a problem by symptoms (e.g., reset only after a reboot or when you connect to Wi-Fi), and get step-by-step instructions for each case, and we’ve compiled up-to-date data on the frequency of the problem among users and prepared a table of compatibility solutions with different versions of MIUI.

Important: Some methods require superuser rights, but most solutions work without them. If you're not ready for firmware experiments, focus on the sections on system settings and cache cleaning.

1. conflict with the function "Memory Optimization" in MIUI

One of the most common reasons for the Redmi 9 wallpaper reset is the aggressive operation of the built-in memory optimizer. MIUI shuts down background processes by default to free up RAM, but sometimes it affects system services responsible for saving user settings, including wallpaper.

How it manifests itself:

• 🔄 Wallpaper is dropped after a long idle phone (for example, at night).
• 📱 Background returns to standard when opening resource-intensive applications (games, video editors).
• ⚡ In the battery log (Settings) → Battery → Battery usage) shows that com.miui.home is often restarted.

To fix this, you need to disable optimization for the launcher:

1. Go to Settings → Applications → Application Management.
2. Find the Launcher app (or com.miui.home) and open its settings.
3. Choose the Battery. → No restrictions.
4. Also disable AutoRun for memory optimizer (Settings → Battery → Battery Optimization → Disable for Louncher).

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If the wallpaper is still reset after this action, try adding the launcher to the list of "Secure Applications" in the battery settings, which will prevent it from being forced to close.

2. Launcher cache errors and those

MIUI actively uses cache to speed up the interface, but sometimes these temporary files are corrupted - especially after updating or changing themes.A damaged cache can lead to the system "forgetting" user wallpaper and loading standard ones.

Symptoms:

• 🖼️ Wallpaper is reset after installing a new theme from the Topic.
• 🔄 The problem appears after manual memory cleaning (via Settings) → Memory).
• 📁 In a file. /storage/emulated/0/MIUI/Theme There are no user wallpaper files.

The solution is to clean the cache:

Clear the launcher cache in Settings → Applications → Launcher → Memory | Delete the Topic app data (note: reset all installed themes!) | Reboot the phone | Install the wallpaper again from the gallery (not from the "Themes" section)

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If the problem persists, check the access permissions to the theme folder:

adb shell pm grant com.miui.home android.permission.WRITE_EXTERNAL_STORAGE


adb shell pm grant com.miui.home android.permission.READ_EXTERNAL_STORAGE

3. MIUI firmware bugs: known versions with a problem

Some MIUI builds for Redmi 9 contain errors that directly affect wallpaper preservation. For example, MIUI 12.0.3-12.0.8 had a bug where the system reset user interface settings after a security update. and MIUI 12.5.2 had a problem using wallpaper from third-party applications (e.g., Zedge or WallpapersCraft).

Up-to-date version data (based on user reports):

How to check out your version of MIUI:

1. Open the Settings. → The phone.
2. See the MIUI version bar (e.g. MIUI Global 12.5.4 Stable).
3. Compare it to the table above.

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If your version of MIUI gets into trouble, try upgrading to the last stable build via Settings → System Update. 80% of the time, this resolves the issue.

4. Conflict with wallpaper applications

Wallpapers by Google, Zedge, Backdrops can conflict with MIUI because of different background mechanisms, because MIUI uses its own wallpaper storage format (.mtz), and third-party applications often write them to a standard Android folder (/Pictures/Wallpapers) that the system ignores.

Signs of conflict:

• 📲 Wallpaper is reset immediately after installation from a third-party application.
• 🔄 The gallery displays the selected background, but on the desktop - the standard.
• ⚠️ A notice appears "Not able to use wallpaper".

Decisions:

1. Install wallpaper through the standard MIUI gallery: Download your favorite image to the Downloads folder. Open it through the Gallery app. Click Set as → Desktop Wallpaper.
2. For apps like Zedge, use the Save to Gallery option, and then apply the background via MIUI.
3. Turn off auto-update wallpaper in third-party apps (this can reset settings).

5. malfunction of Google services (for global firmware)

On Redmi 9 with global firmware (e.g. Redmi 9 Global), wallpaper may be reset due to conflict between Google and MIUI services.

• 🔍 Google Now Launcher (Old, but Some Still Install It).
• 📱 Google Wallpapers as the main application for backgrounds.
• ☁️ Synchronizing wallpaper through Google account.

Critical feature: in MIUI 12.5+, Google services can automatically overwrite wallpaper if the account settings enable "Application Data" synchronization, which causes the background to be reset to the last synchronized option (often standard) after rebooting or connecting to Wi-Fi.

How to turn off the synchronization of wallpaper:

1. Go to Settings → Accounts and Sync → Google.
2. Turn off the switch opposite the Application Data.
3. In the Google app (search engine) open the settings and turn off Personalization → Wallpaper.

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If you use Google Photos for backup, add a wallpaper folder (/MIUI/Theme) to sync exceptions to avoid conflicts.

Hardware problems: damaged memory or connector

Less commonly, but there are cases where the wallpaper reset is associated with physical malfunctions:

• 💾 Damaged sectors of internal memory (especially if the phone falls or overheats).
• 🔌 Problems with the microSD connector (if the wallpaper is stored on the memory card).
• 🔋 Flash memory wear (relevant for phones over 3 years of age with heavy use).

How to diagnose:

1. Check memory for errors through Settings → Memory → Memory Check (if available).
2. Set the wallpaper on the internal memory (not on the internal memory). SD-map) and observe the behavior.
3. Use an application like AIDA64 to check the state of the drive (Store → Health status section).

⚠️ Note: If reading/write errors are detected during the diagnosis (for example, messages appear in logs). E/Storage: Failed to write, this may indicate a failure of memory, in which case it is recommended to transfer important data to another medium and contact the service center.

7.Reset after system update: how to prevent

Many Redmi 9 users are faced with the fact that after the MIUI update, all interface settings (including wallpaper) are reset to standard, which is due to the fact that some updates overwrite the launcher configuration files (com.miui.home).

To minimize the risks:

• 📥 Create a backup of wallpaper: copy files from /MIUI/Theme cloud-to-PC.
• 🔄 Update via Recovery, not over the air: Download the full firmware package from the official website. update.zip and put it in the root of the memory. Update through Settings. → Updating the system → Three points. → Select a firmware file.
• 📋 Use third-party launchers (like Nova Launcher) that are not dependent on updates MIUI.