Unknown file on Xiaomi: how to disable or delete without risk to the system

You opened a file manager on your Xiaomi, Redmi or POCO, and suddenly you found a suspicious file with an unfamiliar name — perhaps with the.apk,.bin or no extension at all? Or the system notified you of a “new file” that you definitely didn’t download? Don’t panic: 80% of the time it’s either a system cache, update residues, or background MIUI processes. But there are exceptions — from adware to potentially dangerous utilities.

In this article, we will discuss how to determine the nature of an unknown file, whether it can be safely deleted, and what to do if it is related to the system. We will not advise “just delete everything in a row” – instead, you will receive a checklist for diagnostics, instructions for different versions of MIUI (including MIUI 14/15), and risk warnings.

1. How to determine what file appeared on Xiaomi

Before you delete something, you need to understand what we're dealing with, and here are the key features that will help you classify an unknown file:

• 📁 File Location: System Files Are Usually Located in Folders /system/, /data/ or /vendor/. User-generated - in /storage/emulated/0/ (internal memory or SD-map.
• 🔍 Extension:.apk – application installer (can be cache or virus);.bin,.img – often associated with firmware or kernel modules;.log,.tmp – temporary files (usually secure); No extension – suspiciously, requires verification.
• ⏳ Date of creation: if the file appeared immediately after the update MIUI, It's probably a system artifact.
• 🛡️ Access rights: System files usually have limited rights (e.g., rw-r)--r--). Files with 777 (full access) rights – a red flag.

If the file is in the /data/app/ or /data/data/ folder, it most likely belongs to the installed application. You can check this through Settings → Applications → Application Management – sort by installation date.

2. Xiaomi system files: what can be touched and what can not

MIUI is actively using background processes to optimize work, and many files appear without the user's knowledge. Here is a list of secure files that can be deleted (if they take up a lot of space):

⚠️ Note: Never delete files from folders /system/priv-app/, /vendor/ or /boot/ — This will lead to a device blink (completely inoperable). Also avoid files called persist*, modem* or boot.img.

3. How to disable the creation of unnecessary files in MIUI

Many "extra" files appear because of MIUI background services, which can be disabled via settings or ADB (for advanced users).

Method 1: Using MIUI settings (without root)

Disable analytics|Limit background activity|Turn off advertising services|Clear the cache of system applications-->

1. Turn off analytics collection:

Settings → About Phone → MIUI version (shap 7 times to activate developer mode)


Settings → Additional → Privacy → Analytics → Disable “Sending Usage Data”

2. Limit background activity:

Settings → Battery and Performance → Battery Management → Select apps → Limit background activity for unnecessary services (e.g. Mi Video, Mi Browser)

3. Turn off the advertising modules (for MIUI 12+):

Settings → Applications → Application Management → Three points (menu) → Show system → Find “msa” (Mobile Services Ads) → Disable

Method 2: ADB (for experienced users)

If you are ready to use ADB, these commands will disable the most intrusive services:

adb shell pm disable-user --user 0 com.miui.analytics


adb shell pm disable-user --user 0 com.xiaomi.ab




adb shell pm disable-user --user 0 com.miui.systemAdSolution

⚠️ Note: Disabling system packages may cause some features to work unstable (such as design themes or cloud backups). → Additionally. → Backup and reset.

4. Deletion of unknown files: step-by-step instructions

If you're sure that the file isn't system-based, you can delete it.

1. Check the file for viruses: Download Malwarebytes or Dr.Web Light from Google Play. Scan the folder with the file (don’t open it!).
2. Backup: Copy the file to your computer or the cloud (in case it proves to be important).
3. Delete the file: Use the built-in File Manager or Total Commander. If the file is not deleted, try using ADB: adb shell rm /path/to/file

Reset the device

If errors appear after deletion (e.g., com.android.systemui stopped), restore the file from the backup or reset settings through Settings → Additional → Backup and Reset → Reset.

💡

Before deleting files with the.apk extension, check if it is an update for the system application. For example, com.google.android.gms-2.apk is part of Google Play Services and deleting it will disrupt Google services.

5. Frequent culprits: what files appear on Xiaomi most often

Analysis of the 4PDA and XDA Developers forums shows that Xiaomi users are most likely to encounter the following “unknown” files:

• 📦 miui_HiddenSettings.apk — Hidden settings menu (you can delete, but you will lose access to some features).
• 📦 com.miui.hybrid.accessory — module for accessories (for example, Mi Band.
• 📦 fw_bcm4359_* — module-fix Wi-Fi/Bluetooth. Don't remove!
• 📦 persist_* — files with the communication module settings. Deleting will cause network loss.
• 📦 miui_debloat_* — cleaning-out MIUI (If you use scripts like Xiaomi ADB Fastboot Tools).

There are a lot of questions about the folder. /MIUI/debug_log/ — It's created when the developer mode is on, and it can weigh a few gigabytes. It can be cleaned, but you better turn off the logging first:

Settings → Additional → For developers → Disable “HCI journal” and “Do not save logs”

6.If the file returned after deletion: what to do

Some files are automatically restored by the system, which is an indication that they are linked to:

• 🔄 Updates MIUI (for example, ota_update.zip);
• 🔄 Background services (e.g. com.miui.daemon);
• 🔄 Advertising modules (e.g. com.xiaomi.mipicks).

Decisions:

1. For updates: Turn off automatic booting in Settings → About Phone → System Update → Three Points → Settings → Turn off “Switching to Wi-Fi”.
2. For services: Use ADB to deactivate the packet (see Section 3).
3. For advertising: install a patch through Magisk (root required). Popular modules: Disabler for MIUI (disables advertising and analytics); MIUI Optimizations (removes unnecessary processes).

If the file is associated with a virus that recovers after a reboot, do:

1. Install an antivirus (e.g. Kaspersky).


2. boot in Safe Mode (hold the power button → "Reboot in Safe Mode").




3. Remove suspicious applications in Settings → Apps.




4. Clear the cache through Settings → Memory → Clear the cache.

💡

If the file is returned after all the manipulations, it is likely critical to MIUI, in which case it is better to leave it alone or contact the XDA Developers forum with logcats.

7.When to contact the service center

There are situations where acting alone can make the problem worse.

• ⚠️ The file appeared after a phone drop or moisture hit (the memory partition may be damaged).
• ⚠️ The device overheats or discharges quickly after the file appears.
• ⚠️ The file has a type name. mmcblk0p* or userdata.img — This indicates damage to the memory partition.
• ⚠️ After deleting the file, the phone is not turned on or loaded into Fastboot.

Xiaomi Service Center can:

• Check the integrity of the file system through fsck;
• Reflash the device with data storage (if only the system partition is damaged);
• Replace the memory module (in case of physical damage).

The cost of diagnostics in official Xiaomi services is usually 500-1000 rubles, and flashing - from 1500 rubles. Unofficial workshops can offer cheaper, but the risk of installing unlicensed software is higher.

FAQ: Frequent questions about unknown files on Xiaomi