Modern smartphones have long turned into powerful multimedia centers, where gigabytes of photos, videos and documents are stored. For owners of the popular Xiaomi Redmi 9 model, the question often arises about how to quickly transfer accumulated information to a computer or, conversely, download movies to watch on the way. Simply connecting a cable to a charging port often does not give the expected result - the PC sees the device only as a power source, ignoring internal memory.
This problem is solved by changing the working regime. USB-The process does not require root rights or the installation of complex software, but knowing the exact algorithm of actions is critical for successful file sharing. In this article, we will discuss in detail how to activate the desired protocol, which cables are best to use and what to do if the computer still does not respond to the connection.
It’s worth noting that shell interfaces may vary slightly depending on the version of MIUI firmware. However, the basic principle remains the same for all devices in the Redmi line. Understanding the logic of the interface will allow you to easily find the right menu items even after major system updates.
Equipment preparation and cable inspection
Before you go into software settings, you need to make sure that the physical health of the connections. Often users are faced with a lack of response of the computer precisely because of poor-quality cable, which supports only charging, but not digital signals. The cable must be an original or certified accessory with sufficient bandwidth.
Visually inspect the connectors for oxidation, dust or mechanical damage. Mud in the USB Type-C port can prevent the contacts from contacting tightly, leading to unstable operation. You can use compressed air to clean the connector or gently clean the connector with a dry soft brush, having previously turned off the device.
⚠️ Note: Using cheap cables without shielding can damage your smartphone power controller or your computer motherboard due to voltage surges.
Try connecting your smartphone to another USB-port, preferably located directly on the computer motherboard (back of the system unit), and not through the front panel or USB-This will eliminate the problem of power shortage or malfunction of a particular port.If you have the opportunity, test the connection with another PC or laptop.
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Use cables labeled "Data" or "Charge & Sync." Cables bundled with cheap power banks often have only two veins inside and are used solely for charging.
Make sure the smartphone screen is unlocked while you connect. Android’s security system by default bans access to the file system if the device is locked, an important measure to protect personal data from unauthorized access.
Activation of file transfer mode in settings
After successfully physically connecting and unlocking your smartphone screen, look at the top of the display. In the notification area, a system message should appear about the USB connection. The standard notification usually reads “Charge via USB” or “USB is connected.” To change the mode, you need to interact with this notification.
Click on the notification text to deploy the hidden menu, and you will see a list of available data protocols, the default system selects the charging mode for security, you need to switch the radio button or select the "Transfer File" option (sometimes referred to as MTP - Media Transfer Protocol), which allows the computer to see the file system of the smartphone as an external drive.
- 📂 File transfer (MTP) — The main mode for working with documents, photos and videos.
- 📸 PTP — Photo transfer mode used by old programs or cameras.
- ⚡ Only charging – safe mode, hiding data from the computer.
- 🎧 MIDI — rare mode for connecting musical instruments.
Once you select File Transfer mode, the computer will make a distinctive sound of connecting the new hardware. In My Computer or This Computer, a new drive will appear called your Xiaomi Redmi 9. You can now copy, delete and move files between devices.
☑️ Connection check
If the notification does not appear automatically, we move to a deeper setting through the Developer Menu, which is a universal method that allows you to force the required connection protocol.
Configure through the “Developers” menu
In some versions of MIUI firmware or certain security settings, the automatic pop-up may not appear, in which case you need to manually activate the debugging mode and select the USB configuration. First, you need to unlock the hidden “Developers” menu, which is hidden from the eyes of the average user by default.
Go to Settings. → About the phone. Find the line "Version." MIUI» And press it fast. 7-10 It'll tell you you've become a developer, and then go back to the main settings menu, select Extra. → For developers.
In the list that opens, look for the "Network" or "Debugging" section, and we're interested in the "Default USB Configuration" item. Click on it and select "File Transfer (MTP)" and the mode you want to use will automatically activate every time you connect your smartphone to your computer.
⚠️ Note: Do not turn on the "Debugging by" mode USB», If you don't know what it's for, it gives you full access to the system and can be used by attackers when you connect to an infected PC.
You can also find the item “Debugging by” in this menu. USB». It is only required for advanced users using tools such as ADB For flashing or deep diagnostics, you don't need to include it for normal photo and document transmission.
What does PTP mode do?
Solving driver problems on Windows
Even with the right smartphone settings, the computer may not see the device due to lack or conflict of drivers.The Windows 10 and Windows 11 operating system usually automatically installs the necessary components, but in the case of Xiaomi, manual intervention is sometimes required.
Open Device Manager on your computer (can be found through a search on the Start menu). Connect your smartphone in data mode. If the driver is not installed, a device with a yellow exclamation mark or the name "Unknown Device" will appear in the list. Right-click on this device and select "Update driver".
Select automatic driver search. If the system does not find them, you can use the Mi PC Suite or universal Google USB Driver. Often, removing the device from the dispatcher and then reconnecting the cable helps.
| Problem. | Possible cause | Method of decision |
|---|---|---|
| The computer is not responding. | Faulty cable | Replace the cable with a quality analogue |
| Only the charge is visible. | Not selected MTP mode | Switch in the notification curtain |
| Driver error | Conflict PO | Remove the device in the controller and reconnect |
| Files are not copied. | Damage to the file system | Check the disk for errors or reset the settings |
If none of these methods work, try disabling the antivirus or firewall while you're on the phone. Sometimes the security software blocks new ones. USB-devices, considering them potentially dangerous.
Alternative methods of data transmission
If a wired connection is causing permanent difficulties or a cable is lost, modern technologies offer wireless alternatives. For owners of the Xiaomi and Windows ecosystem, Mi Share (or its equivalent ShareMe) application is an excellent solution, which allows you to transfer files over Wi-Fi at high speed.
You can also use cloud storage, such as Google Drive, Yandex.Disk or the built-in Mi Cloud. By uploading files to the cloud from your smartphone, you can access them from any computer through your browser, which is convenient for synchronizing documents and photos in the background.
- 📡 Mi Drop/ShareMe – Wi-Fi Direct fast transmission without internet.
- ☁️ Cloud Services – Automatic Synchronization and Access from Everywhere.
- 📶 FTP-server – creating a file access point through Windows Explorer.
- 🔵 Bluetooth is a slow but versatile way for small files.
To create FTP-Servers on a smartphone can use file managers, for example, MI Explorer: From the menu, select Access from PC, click Launch, and the smartphone will give you the address you want to enter in the address bar of Windows Explorer, which allows you to work with files as a regular folder on your computer.
Frequent questions and troubleshooting
Users often face a situation where after updating the system settings are reset, and the phone only starts to charge again, in which case it is enough to re-select the mode in the notification curtain. If the problem is repeated constantly, it makes sense to check for updates for the system or reset the network settings.
Another common problem is slow copy speeds, which can be caused by using a USB 2.0 port on your computer or cable. For maximum speeds, use USB 3.0 ports (blue) and short cables with thick veins.
⚠️ Warning: When retrieving a device, always use the Safe Device Removal feature in Windows to avoid data loss or file system damage.
If the computer sees only internal memory, but does not see SD-In some cases, the card needs to be formatted as "Inner Memory" (although this will hide it from direct access) or as "Portifical Media" to transfer files through the Internet. USB The card must be formatted in the file system FAT32 exFAT.
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Connection stability depends on the quality of the cable and choosing the right MTP mode in the notification curtain.
In the event of complete incapacity USB-If you're in a port on your smartphone after a drop or moisture, software methods won't help.