Cleaning system files on Xiaomi: what can be deleted and what – categorically impossible

System files on Xiaomi smartphones take up the lion’s share of internal memory, but not all of them can be safely deleted. Many users face a situation where the device shows “memory is full”, although there are almost no photos, videos and applications on it. The reason often lies in hidden system data, cache and debris that accumulates for years. However, blindly deleting files from /system or /data folders can lead to a critical MIUI failure or even “bricking” the phone.

In this article, we’ll look at which system files can be cleaned without risk and which ones are strictly forbidden to touch. You’ll learn about Xiaomi’s built-in memory optimization tools, hidden folders that are safe to clean, and alternative methods to avoid using them. ADB to manually remove unnecessary updates, and we will focus on the models in the MIUI 14/15 HyperOS, where the storage structure has changed.

Why System Files Take So Much Space on Xiaomi

Xiaomi’s MIUI-based smartphones (and now HyperOS) are known for their voraciousness to internal memory. Even on newer 128-256GB devices, users often see 15-30GB of “system” taken up immediately after unpacking.

• 📦 Duplicate firmware. When updated through OTA The system saves the old version in case of rollback, taking up to 2-4 GB.
• 🗑️ System applications cache: Google, Mi Account and pre-installed utilities (Mi Video, Music) accumulate gigabytes of temporary files.
• 🔄 Logs and dumps. MIUI Maintains detailed logs of the system (/data/log), which are rarely cleaned automatically.
• 🎯 Preloaded data: Theme Store's advertising modules, themes and fonts take up to 1-2GB.

For example, on the Redmi Note. 12 Pro+ s MIUI 14 Users are often found in a folder /data/app duplicates APK-files from older versions of applications that the system does not delete when updating. 13 Ultra with HyperOS can take up to 5 GB folder /data/media/0/MIUI/backup backup.

What System Files Can Be Deleted Without Risk

Not all files in system folders are equally important, but here is a list of data that can be safely cleaned:

And you should pay special attention to the /data/app-lib folder, which is where the application libraries are stored. If you delete files from the programs that are running here, they will stop running. But the remote application libraries can be cleaned.

⚠️ Note: Never delete files from folders /system/bin, /system/priv-app or /vendor. This will result in the inability to boot the system and require reflashing through Fastboot.

Remove the old ones OTA-packet /data/ota_package

Clear the cache through Settings → Memory

Check the folder. /MIUI/debug_log log-in

Remove unused themes in /MIUI/theme

Check duplicates APK into /data/app-->

How to Clean System Files Without Root Rights

If you don’t have superuser rights, you can still free up a few gigabytes of memory with built-in tools and third-party apps.

Method 1: Built-in utility "Cleaning"

The simplest method is:

1. Open the Settings → Memory.
2. Click "Clean" (or "Free space" in HyperOS).
3. Select the categories to delete: "App cache", "Downloads", "Junk files".
4. Confirm the cleanup.

This method removes up to 1-3 GB of unnecessary data, but does not touch deep system files.

Method 2: Remove old updates

After each OTA-update MIUI It saves the old firmware in case it rolls back:

1. Go to Settings → About the phone → System update.
2. Press three points (⋮) top-right.
3. Select "Remove the downloaded package".

On some models (e.g. POCO F5), this item may be called “Clear Update Cache”.

Method 3: Third-party applications

Apps like SD Maid or Files by Google can find additional junk:

• 🧹 Residual files from remote applications.
• 📁 Empty folders in /sdcard.
• 🔍 Duplicate files (e.g. screenshots with the same content).

⚠️ Note: Do not use "memory optimizers" such as Clean Master or CCleaner. They often delete the desired system files, which leads to lags and errors in the system. MIUI.

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If the memory is still filling up quickly after cleaning, check the /sdcard/Android/obb folder – gigabytes of cache from games can be stored here (for example, Genshin Impact or Call of Duty Mobile).

Cleaning system files with root rights

If you have root access, you can delete many more files that you don't need, but it's important to be careful, and an error can lead to a "boothole" or a phone that's completely inoperable.

What can be removed from root

• 🗃️ folder /data/dalvik-cache — Dalvik cache, which is regenerated when you reboot. 1–2 month.
• 📜 Files in /data/local/tmp — temporary data that are rarely used.
• 🔄 Old cores in /boot (Only if you are sure that the new kernel is stable!).

How to Clean Up With Root Explorer

1. Install Root Explorer or Solid Explorer with root support.
2. Go to /data or /system.
3. Delete files from the permitted folders (see the list above).
4. Do not delete files with.odex,.apk extensions to /system/priv-app or.prop to /system.

Cleaning through ADB (without root, but with debugging)

If root is not available, but USB debugging is enabled, you can use ADB to delete some system files:

adb shell pm clear com.miui.analytics # Cleanup of MIUI Analytics


adb shell rm -rf /data/local/tmp/* # Delete temporary files




adb shell rm /data/ota_package/* # Removal of old OTA- packets

⚠️ Attention: Adb shell rm command -rf /system/* It will immediately destroy your phone, making it unusable!

Xiaomi’s Hidden Folders That Can Be Cleaned

MIUI and HyperOS have many hidden folders that are not visible in a standard file manager, but take up gigabytes of memory.

To see hidden folders, use a file manager that supports hidden files (such as FX File Explorer or Total Commander).

For example, on Xiaomi. 12T Pro folder /MIUI/debug_log may take up 2,5 GB because of the detailed logs of the camera and the processor. POCO X5 Pro in /Android/data/com.xiaomi.gamecenter Gigabytes of Game Turbo cache are often accumulated.

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Always check the contents of hidden folders before removing them, for example, important backups of SMS or notes may be stored in /MIUI/backup.

How to prevent memory from being filled with system debris

To avoid having to clean your system files regularly, set up Xiaomi for automatic optimization:

• 🔄 Turn off automatic update downloads in Settings → The phone. → Updating the system → ⋮ → Settings → Downloading.
• 📵 Limit background activity for unnecessary apps in Settings → Annexes → Permits → Auto-start.
• 🗑️ Enable automatic cleaning in Settings → Memory. → Autocleaning (available on MIUI 13+).
• 🚫 Avoid saving logs (only for power users): adb shell setprop persist.logd.size 0

It is also recommended to check the folder once a month. /sdcard/Download — There are often unnecessary APK-Files and archives that you forget to delete.

On devices with HyperOS (such as Xiaomi 14 or Redmi K70), Deep Cleanup has been introduced, which analyzes system files and suggests removing unnecessary data without risk, to activate it:

1. Go to Settings. → Memory.
2. Click on "Deep Clean" (may be called "Extended Cleaning").
3. Confirm the scan.

Frequent errors in cleaning system files Xiaomi

Many users make critical mistakes in trying to make room, which result in data loss or phone failure.

• ❌ Deletion of files from /system Even if you know what you're deleting, always back up through TWRP Mi Flash.
• ❌ Cleaning the folder. /data/data It stores all the applications' data, including SMS, Contact and save games.
• ❌ Use of rm commands -rf One typo, and you delete the whole system.
• ❌ Delete files with the.apk extension in /system/priv-app. This will lead to the collapse of system services.

For example, there are often stories on forums where Redmi Note 10 Pro users delete the /system/media folder, after which the phone stops playing sounds and boots normally. or POCO X3 Pro owners who clear /data/dalvik-cache without rebooting, resulting in endless “Application Stopped” errors.

⚠️ Note: If Google Services or Mi Account stop working after cleaning, check the integrity of the files in the file. /system/priv-app/PrebuiltGmsCore and /system/priv-app/MiAccount. Recovery will require re-flashing.

FAQ: Answers to Frequent Questions