The built-in file system of the Android operating system is built on Linux security principles, where access to critical directories is strictly limited to the average user. The folder /system is the heart of the device, containing firmware files, system applications, libraries and fonts that are responsible for the stable operation of the entire interface.
An attempt to open this directory using standard means may lead to an access error, since the partition is mounted in Read-Only mode. To make changes or detailed analysis of the content, you will need special tools, such as third-party file managers with Root support or obtaining full superuser rights. Before you start manipulating system files, you need to understand that any careless action can turn your smartphone into a “brick”. Deleting even one small file from a folder ADB (Android Debug Bridge), third-party file managers with Root support or obtaining full superuser rights.
Prezhde chem pristupat k manipulyatsiyam s sistemnymi faylami, neobkhodimo ponimat, chto lyuboe neostorozhnoe deystvie mozhet prevratit vash smartfon v"kirpich". Removing even one small file from a folder fonts or framework can cause a cyclic reboot or complete inoperability of the device.
Why do you need access to system files at all
A standard user storage for photos and documents is enough, but advanced users modders often look inside the system for deep customization. One of the main goals is to remove bloatware software pre-installed by the manufacturer, which cannot be uninstalled in the usual way through the settings.
Also, access to the section /system/app or /system/priv-app allows you to replace standard applications with their modified versions, change system fonts, icons and even loading animation. Some users use this access to move heavy applications to the system's internal memory in order to free up space in the user partition.
⚠️ Warning: Changing access rights (chmod) to system folders without understanding the consequences can break SELinux and make the system vulnerable to malware.
Another reason is to restore the system after unsuccessful experiments. If you have access to the file system, you can manually replace the damaged file with the original copy, avoiding completely flashing the device through the computer.
Methods of access without root access via ADB
The safest way to look inside the system without losing the warranty and the risk of locking the bootloader is to use USB debugging. This method requires connecting the smartphone to the computer and installing drivers, but it allows you to view files and even temporarily mount a partition in recording mode.
To get started, you need to activate developer mode. Go to Settings → About phone and quickly click 7 times on the item Build number. After this, a new section “For Developers” will appear in the menu, where you need to turn on the toggle switch USB debugging.
Connect the device to the PC and open a command line or terminal with ADB installed. Enter the command adb shell to enter the device shell. By default, you will be in user mode shellwhich has read rights to most system files, but no write rights.
adb shell
ls -la /system
This sequence of commands will allow you to list the contents of the system folder directly in the terminal. You will see files and directories, but you can copy them to your computer only with the command adb pull. For example, the command adb pull /system/build.prop will save the build configuration file on your desktop.
Use the command "adb shell pm list packages -s" to view a list of all system applications before attempting to remove them.
Using file managers with Root support
If your device already has unlocked bootloader and installed Magisk or another superuser rights manager, the process becomes much simpler. Specialized file managers, such as Root Explorer, MiXplorer or Solid Explorer, are able to request elevated privileges when opening system partitions.
When you first launch such an application and try to go to the folder /system, a request from the superuser will appear on the screen asking you to confirm access. After confirmation, the file manager interface will change: usually a button R/W (Read/Write) appears, which switches the partition access mode from read to write.
- 📁 Allows you to visually move files with a drag-and-drop interface.
- 🔒 Automatically creates backup copies before editing critical ones files.
- ⚙️ Makes it possible to change access rights (chmod/chown) for each object.
It is important to note that even with root access, modern versions of Android (starting from 10 and higher) use dynamic partitions and system Project Treble. This means that some files may be hidden or replaced by overlays, and direct editing will not give the expected result without disabling download verification.
Table of main system directories
Inside the root folder /system there is a strict hierarchy, knowledge of which is necessary for safe navigation. Below is a table describing the key subdirectories that you will encounter when opening access.
| Directory | Purpose | Risk level |
|---|---|---|
/system/app |
Standard user applications | Medium |
/system/priv-app |
Critical system services and settings | High |
/system/framework |
Java libraries and interface resources | Critical |
/system/fonts |
System fonts and types display | High |
/system/media |
Interface sounds, ringtones, animation | Low |
Particular attention should be paid to the folder priv-app. Unlike a regular folder app, applications that have access to the system’s protected APIs are stored here. Removing a service from here Google Play Services or the system launcher is guaranteed to result in the smartphone not working.
What are overlays in Android?
Overlays are resource overlay mechanisms that allow manufacturers to change the appearance of the system without changing the underlying files. Changes to the original may be covered by the overlay.
Mounting the partition in write mode
By default, the Android file system is mounted as ro (read-only). To make changes through the terminal or scripts, you need to remount it in rw (read-write) mode. This can be done with the mount command, but the syntax may differ depending on the kernel version and file system (ext4, f2fs).
For devices with the new mechanism system-as-root the traditional command may not work. In such cases, a utility mount is used indicating a specific mount point. Often you need to first access the blkid of the device.
su
mount -o rw,remount /system
If the command returns a "Read-only file system" error, the dm-verity (integrity check) function may be enabled. In this case, simple remounting is not enough, and you need to disable verification via the bootloader or install patches in Recovery mode.
⚠️ Attention: Interfaces and commands may change with the release of new versions of Android. Always check the latest instructions for your specific model and firmware version on specialized forums.
After completing all manipulations, it is strongly recommended to return the partition to read-only mode with the command mount -o ro,remount /system. This will protect random processes from damaging files during normal system operation.
☑️ Safe editing of the system
Restoring the system after errors
If after opening the folder system and making changes the phone stops booting, it’s too early to panic. In most cases, the device will get stuck on the manufacturer's logo (bootloop). The first step should always be to enter the mode Recovery.
In stock recovery, the "Wipe cache partition" option is often available. This action is safe for personal data, but may delete temporary conflict files that arose after replacing system libraries. If this does not help, you will need a complete factory reset.
For more complex cases when critical files have been deleted, only flashing it via a computer will help. Use tools like Odin for Samsung, SP Flash Tool for MediaTek or Fastboot for Google and Xiaomi devices. The presence of the original firmware image (stock ROM) is a prerequisite for successful recovery.
Always keep a copy of the original stock firmware specifically for your model on your computer - this is the only reliable way to save a “bricked” device.
Frequently asked questions (FAQ)
Is it possible to open the system folder without a computer?
Yes, it is possible, but only if the device has already been Rooted. You will need a file manager with root support, such as Root Explorer. Without Root and without a computer, access is only possible in read mode through terminal emulators with limited rights.
Is it safe to delete files from the /system/app folder?
No, it is not safe without deep knowledge. Many system applications are interconnected. Removing a useless service may disrupt your phone, Bluetooth, or camera. Always use freezing applications instead of completely uninstalling them to check stability.
Why are my changes to the system reset after a reboot?
Most likely, you have the boot verification function (dm-verity) activated or the system uses dynamic partitions. Changes are not written to disk permanently, but are reset on every reboot. It is necessary to disable verification or modify the system image.
Do you need to unlock the bootloader to access the system?
For full recording (changing files) - yes, unlocking the bootloader is required. To simply read content via ADB, unlocking is not required, just enable USB debugging in the developer settings.
What is the risk of getting a virus when opening system?
The risk is high if you download modified system files from unverified sources. Malware placed in /system/priv-appgets superuser rights and can quietly intercept passwords, SMS and access to banking applications.