Directory /data/data in the Android operating system is a closed storage intended for storing private data of installed applications. By default, access to this section is blocked for the user in order to ensure security and stability of the system. However, situations that require manual intervention arise regularly: restoring progress in games after a reset, transferring databases, or analyzing app logs.
Standard file managers pre-installed on devices do not allow access to this directory, since only the superuser or the owner application itself has access rights to it. To bypass this limitation, you must use special tools or gain elevated privileges. The process of copying files to this folder requires caution, since damage to the data structure can lead to the software not working.
In this guide, we will look at all the current methods for performing this task: from using the ADB debug bridge to using root access. You don't need to be a programmer to perform these steps, but you should follow the instructions carefully to avoid file system errors.
Why access to the data folder is restricted by default
Android's security architecture is built on the principle of application isolation (sandboxing). Each application runs in its own space and cannot directly access data from other apps without explicit permission from the system. The folder /data/data contains subdirectories with package names where settings, databases SQLite and cached files are stored.
Access restrictions prevent malware from stealing confidential information. If any file manager could read the contents of this directory, attackers could easily steal authorization tokens, messages, and user activity history. That is why the standard interface Android hides these sections from the eyes of the average user.
⚠️ Attention: Forcibly changing access rights to system files may break applications or lead to security validation errors (SafetyNet/Play Integrity).
Despite the protection, device administrators and advanced users often need access to this data for backup or debugging. For this, there are legal development tools provided by the company Google, as well as methods for gaining full control over the device.
Before any manipulations with system folders, be sure to create a full backup of the device via Google Drive or locally to your computer.
Method 1: Using Android Debug Bridge (ADB) without Root
The most secure and universal method of working with system directories is to use the utility ADB (Android Debug Bridge). This tool is part of the package Android SDK Platform-Tools and allows you to send commands from your computer to your smartphone via a USB cable. This method does not require obtaining root access, but does require enabling debugging mode.
First, connect your smartphone to the computer and make sure that permission for USB debugging appears on the device screen. Once the connection is confirmed, open a command prompt or terminal on your PC. The first step is to check the visibility of the device with the command adb devices. If the list displays a serial number with status device, the connection was established successfully.
To copy a file from the computer to a specific application folder, use the command adb push. The command syntax requires the full path to the file on the computer and the target path on the device. For example, to replace a settings file, the command will look like this:
adb push C:\backup\settings.xml /data/data/com.example.app/files/settings.xmlIt is important to understand that without root access you cannot simply write a file to someone else's directory if the application does not allow this through its mechanisms. However, ADB often has privileges shellthat are sufficient to work with some sections available for debugging. If the command returns an error Permission denied, then a higher level of access is required or the use of workarounds through backup.
☑️ Preparing to work with ADB
Method 2: Working with superuser rights (Root)
Having root access allows full access to the entire file system Android, including protected sections. If your device is rooted, the process of copying files to /data/data becomes a trivial task, accessible directly from the smartphone screen. This will require specialized file managers, such as Root Explorer, Solid Explorer or MT Manager.
After launching such a manager, you must activate superuser mode by clicking the appropriate button (often depicted as a key or root icon). The application will request permission through the rights manager SUwhich must be confirmed. After activation, you will be able to freely navigate the directory /data and enter subfolders data.
The copying process is carried out according to the standard algorithm: find the source file in the internal storage or on the memory card, select the “Copy” or “Cut” option, go to the target folder /data/data/com.package.name and click “Paste”. The system will automatically apply the necessary access rights (chmod/chown) to the new file, which is critical for its correct operation.
- 📂 Use the “Mount R/W” function if the folder is read-only.
- 🔐 Check the owner of the file: it must match the name of the application package (u0_aXXX).
- 🔄 Do not overwrite system files if you are not sure of their origin.
What to do if the application crashes after copying?
Most often the problem lies in incorrect permissions to the inserted file. Try long-pressing on the file, selecting "Properties" or "Permissions" and setting the Read/Write values for owner and group, similar to other files in this folder.
Method 3: Backup/Restore
An alternative to directly copying files is to use the Android backup mechanism. The ADB utility allows you to create a complete backup of application data, including the contents of the folder /data/data, into one file on your computer. This method is especially useful when you need to transfer data between different devices or restore the state after a reset.
The command to create a backup looks like this: adb backup -f backup.ab -noapk com.package.name. The flag -noapk indicates that only user data should be saved, without the application installation file. The resulting file .ab can be unpacked using third-party utilities (for example, Android Backup Extractor), extract the necessary files and place them back during recovery.
To restore data, use the command adb restore backup.ab. The device will ask the user for confirmation on the screen, after which the process of unpacking the data into the appropriate system directories will begin. This method guarantees the integrity of the folder structure and the correctness of access rights, since the recovery is performed by the operating system itself.
| Method | Root required | Complexity | Risk of data loss |
|---|---|---|---|
| ADB Push | No (partially) | Average | Low |
| Root manager | Yes | Low | Average |
| ADB Backup | No | High | Low |
| Titanium Backup | Yes | Low | Low |
Solving problems with access rights and owner
Even if you were able to physically copy the file to a folder /data/data, the application may refuse to read it. The reason lies in the file attributes: owner and group. On Linux-like systems, which includes Android, the application process runs on behalf of a specific user (for example, u0_a123) and does not have rights to read files owned by another user or root.
When using manual copying through root managers, the file is often created with an owner root. To fix this, you need to change the file attributes. In the terminal, this is done with the command chown. An example of a command to change the owner to the application user:
adb shell chown u0_a123:u0_a123 /data/data/com.example.app/files/config.dbIt is also important to check the access rights (permissions). Typically, data files should be readable and writable only by the owner. The command chmod 660 or chmod 600 is most often the optimal solution. Incorrect permissions may result in the application seeing the file but not being able to open it, or, conversely, the system will block the application from launching for security reasons.
⚠️ Attention: Interfaces and commands may differ on different versions of Android. On modern versions (Android 11-14), access to the folder
/data/dataeven with root access can be limited by the Scoped Storage mechanism.
Correct access rights (chmod) and the file owner (chown) are as important as the very presence of the file in the directory. Without them, the application will not be able to read the data.
Frequently asked questions (FAQ)
Is it possible to copy files to the data folder without a computer?
Yes, this is possible if the device has root access. You will need a file manager with root support, such as Solid Explorer or Root Explorer. Without root access and a computer, writing access to this folder is almost impossible due to Android security restrictions.
Is it safe to change files in the /data/data folder?
Changing files carries risks. If you damage the database or settings file, the application may stop running or lose all data. Always make a copy of the original file before replacing it so that you can roll back changes.
Why does the adb push command return a Permission denied error?
This error means that the user shellwho is running ADB does not have permission to write to the target directory. This is standard behavior for unprotected devices. To bypass the restriction, you need root access or use the command adb root (works only on engineering firmware).
Where can I find the application package name for the folder path?
The package name usually looks like com.developer.appname. It can be found in the Google Play store in the address bar of the browser or through applications like App Inspector. The package name is also displayed in the application settings in the “About the application” section.
What should you do if, after copying, the game says “Data is corrupted”?
Most likely, you copied files from a different version of the application or for a different processor architecture. Also check whether the file is protected by encryption tied to a specific device or Google account. In such cases, simply copying files will not work.