Why your computer can’t see the Xiaomi Redmi 9 via USB, but your phone is charging: full problem

The situation is familiar to many owners of Xiaomi Redmi 9: you connect your phone to your computer through the phone. USB-The cable, the charging light, but the system doesn't detect the device, no connection sound, no conductor icon, no file transfer capability, whether the cable is broken, the drivers are to blame, or this is a feature of the firmware. MIUI?

In fact, there can be more than a dozen reasons - from the banal charging mode to hardware faults of the controller. USB. In this article, we’ll look at all the possible scenarios why Redmi 9 isn’t coming to PC. USB, But it's charging normally, and you'll get checklists for diagnostics, step-by-step instructions for fixing the problem, and answers to frequent questions. MIUI, Often overlooked even by experienced users.

1. Checking the underlying causes: cable, port and connection mode

Start with the simplest thing, eliminate the obvious hardware problems, and most often it's not the phone that's to blame, it's the cable or the cable. USB-The computer port. Here's what you need to do first:

• 🔌 Try another cable. Use the original Redmi 9 or certified cable. USB-C Data-enabled cable (not all charging cables support file transfer!).
• 💻 Connect to the other one. USB-On laptops, the ports on the right and left side can connect to different controllers. USB 2.0 (black) – it is more stable than the USB 3.0 (blue).
• 📱 Unlock the phone screen. MIUI Some connection modes require unlocking the screen to activate data transfer.
• 🔄 Restart both devices. Sometimes it helps to just reboot your computer and your smartphone, and it will reset temporary disruptions. USB-controller.

If you still don't know Redmi 9 after this manipulation, move on to the next step, and note that if the phone is charging but it's not transmitting data, the problem is almost certainly not physical damage to the connector (otherwise charging wouldn't work either), so it's software settings or drivers.

USB Settings on Xiaomi Redmi 9: Hidden MIUI Settings

Firmware MIUI It is known for its “surprises” in the form of hidden settings that can block the connection to the Internet. USB. Many users do not know that Redmi 9 has a separate mode. USB-You need to manually turn on the connection. Here's how to do it:

1. Connect the phone to the computer.
2. Swipe down the notification bar and find the USB option to transfer files (or Charge via USB).
3. Select File Transfer Mode (MTP).

If this option is not in the curtain, it's hidden in the developer's settings.

1. Go to Settings. → The phone.
2. Tap 7 times on the MIUI version until the message “You became a developer” appears.
3. Return to the main settings and open Additional settings → For developers.
4. Find the default USB configuration option and select File Transfer (MTP).

Important! Some versions of MIUI for Redmi 9 may also need to disable the USB Debugging option in the developer menu if it is active. Also, check if Charging Only is enabled in the battery settings - it can block data transfer.

3.Driver problems on your computer: how to install the correct

If Redmi 9 is not detected on a PC but is charging, 70 percent of the time it is missing or outdated drivers. Windows can recognize the phone as an "unknown device" or ignore it altogether. Here's how to diagnose and fix the problem:

First, check if the phone is detected in Device Manager:

1. Press Win + X and select Device Manager.
2. Deploy the USB Controllers or Portable Devices section.
3. If you have a device with a yellow exclamation point (such as the Xiaomi Composite MDB Interface), right-click on it and select Update Driver.

If automatic updates do not help, install drivers manually:

• 📥 Download the official Xiaomi drivers from the site MIUI Downloads (Driver section).
• 🔧 Or use the universal package Mi. PC Suite (it automatically installs all the necessary drivers).
• 🖥️ For Windows. 10/11 You can also try to install the driver. MTP via Windows Update.

Critical detail: If you connect Redmi 9 to your computer for the first time, Windows may require confirmation of installing the driver for "ADB Interface." Allow installation, otherwise the data transfer will not work.

4. Hardware malfunctions: how to check the connector and USB controller

If all the software methods have been tried, but Redmi 9 is still not visible on the PC, it may be a hardware problem.

⚠️ Warning: If you suspect a malfunction USB-If you want to clean the connector, don't try to clean it with alcohol or a needle without experience, it can damage the contacts. You better go to the service center. Oxidation or contamination of the connector is often the reason why the Redmi 9 charges, but doesn't transmit data.

Another nuance: on some Redmi 9 after falls or impacts, the plume connecting the track may depart. USB-In this case, the charging can work (because the power is direct), but the data transmission can't.

5. Conflicts with antiviruses and firewall

Few people know, but antivirus and Windows firewall can block Xiaomi’s USB connection, perceiving it as a potential threat, especially for programs like Kaspersky Internet Security, Avast or ESET NOD32, which aggressively scan connected devices.

To check if the antivirus is to blame:

• 🛡️ Temporarily disable the antivirus and Windows firewall, then reconnect the phone.
• 🔍 Check the antivirus log for locks on devices named Xiaomi or MTP.
• 🔄 Add Mi. PC Suite or adb.exe process to exclude antivirus.

If Redmi 9 starts to be detected after you turn off, add it to the whitelist. In Kaspersky, for example, it is done as follows:

1. Open the antivirus settings.
2. Go to the Supplementary → Threats and exclusions.
3. Add an exception to the Xiaomi Redmi 9 device or the MTP process.

⚠️ Warning: Don't leave the antivirus off for long, it could put your computer at risk of infection. Use this method only for diagnostics.

6. Resetting settings and extreme measures

If none of the previous methods worked, there are radical ways to reset your phone or computer settings. Start with the safest option:

• 🔄 Resetting settings USB (not delete data):
• 📱 Reset all settings (deletes data but saves files):
• 💻 Windows System Restore:

If you're willing to go to extreme lengths, you can try flashing your phone through Fastboot, which is true if the problem comes after a MIUI update or a failed firmware.

1. Download the official firmware for Redmi 9 (codenamed Lancelot) from the Xiaomi Firmware Updater website.
2. Unpack the archive and launch the script flash_all.bat (Windows).
3. Connect your phone in Fastboot mode (Loudness down + Power).

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Fastboot removes all data from your phone, including photos and apps. Be sure to back up your phone via Mi Cloud or third-party utilities before the procedure.

7. Alternative ways to transfer files if USB is not working

If you can’t get Redmi 9 to be detected via USB, don’t despair – there are several alternative ways to transfer files:

• 🌐 On Wi-Fi (Mi Drop, FTP, LocalSend):
• ☁️ Cloud storage (Mi Cloud, Google Drive):
• 📡 Bluetooth or NFC:
• 🔌 OTG-adapter + flash-drive:

💡

If you need to transfer files from Redmi 9 to your PC frequently, set up automatic sync via Mi Cloud. Go to Settings → Accounts → Mi Cloud → Sync and enable the option for the desired file types.

FAQ: Frequent questions about connecting Xiaomi Redmi 9 over USB