How to connect Xiaomi Redmi Note 9 to your computer via USB: all ways and solutions to errors

Connecting Xiaomi Redmi Note 9 to your computer via USB-The cable seems like a simple task, but in practice, users face a lot of nuances, from the lack of system response to file transfer errors. MIUI, This is a default device that blocks access to the device's memory without any additional settings. In this article, we'll look at not only the basic steps of connection, but also the hidden settings that the manufacturer doesn't advertise.

Features of the Redmi Note 9 (model M2003J15SC/M2003J15SS) It is based on the MediaTek Helio chip. G85, This affects compatibility with Windows drivers, and after the updates, MIUI 12+ logic USB-The connection has changed, so that the system can automatically switch between Charging and File Transfer modes without notifying the user.

What connection modes supports Redmi Note 9

Xiaomi Redmi Note 9 offers 4 basic USB modes, but not all of them are available out of the box. By default, the device is defined by the computer as a media player (MTP), but in the developer settings you can activate additional options:

• 🔌 Charging Only – Basic mode that blocks access to memory (used by default when first connected)
• 📁 File transfer (MTP) — standard protocol for exchanging data with Windows/macOS
• 🖥️ PTP (camera – mode for importing photos/video as from a digital camera
• 🔧 USB-modem – distribution of the Internet from the phone (requires activation in the settings)
• 🛠️ Debugging by USB — Hidden mode for developers (included through Settings) → The phone)

It's important to understand that MIUI 14 (the current version for the Redmi Note 9 in 2026) can automatically reset USB settings when you connect to a new computer, which is done for security reasons, but it's uncomfortable. For example, if you used File Transfer mode before, and after you upgrade the system, the phone is again designated as Charging, it's not a failure - that's how Xiaomi's protecting works.

Step-by-step: how to connect Redmi Note 9 to a PC

Before connecting, make sure you have an original USB Type-C cable (it comes with a USB 2.0 cable, but USB 3.1 is better for high-speed data transfer). Cheap uncertified cables can cause connection errors or limit transfer speeds to 480 Mbps.

Unlock the phone screen (PIN/pattern lock)

Use the original USB Type-C cable

Connect the cable to the USB 3.0 port on your PC (blue connector)

Open the notification curtain on your phone after connecting

-->

1. Connect the Redmi Note 9 to your computer via USB-The phone screen will show a notification "Charge through" USB".
2. Swipe down to open the notification bar and tap the message "USB to charge".
3. In the window that opens, select File Transfer (or Camera (PTP) if you want compatibility with older programs like Lightroom Classic).
4. The phone's folder Explorer window will open on your computer, and if that doesn't happen, check the driver section.

Redmi Note 9: When you first connect to a new PC, the phone asks for confirmation RSA-debug-key USB, Even if you haven't activated this mode, click "Allow" or access to files will be restricted.

Solving driver problems on Windows 10/11

If the computer does not recognize the Redmi Note 9 or gives an error "USB device is not recognized", the problem in 90% of cases is due to the lack of drivers for the MediaTek chipset. Xiaomi's official website does not provide separate drivers for this model, so you will have to use universal solutions.

For manual installation of drivers:

1. Open Device Manager (Win + X → Device Manager).
2. Find the list of "Other devices" → "Redmi Note 9" with an exclamation point.
3. Right-click → “Update driver” → “Perform a search on this computer”.
4. Select "Select driver from list" → "MTP devices".

⚠️ Note: If after updating the drivers, the phone stopped being defined at all, roll back the changes via System Restore (Windows) or reset the settings. USB on the phone: Settings → System system → Resetting settings → Resetting settings USB.

How to enable USB debugging and hidden modes

USB debugging mode offers enhanced connectivity, including access to ADB and Fastboot. This is necessary for firmware, unlocking the bootloader or using tools like Scrcpy. On the Redmi Note 9, this mode is hidden and requires pre-activation.

Instructions for inclusion:

1. Go to Settings. → The phone.
2. 7 times tap on the item "Version" MIUI", The message is, “You’ve become a developer!".
3. Return to the main settings menu and open a new section for developers.
4. Activate switches: Debugging by USB Unlocking OEM (if you plan to firmware) Default USB configuration → Select File Transfer

Once activated, connect your phone to your PC. A confirmation request will appear on the screen. RSA-keys – be sure to click “Allow”, otherwise access to ADB This key is tied to a particular computer, so when you connect to another PC, the request will be repeated.

File Transfer: Speed Optimization and Error Solving

Even with the right connection, Redmi Note 9 users often experience low data rates (less than 10MB/s) or errors like “Failure to copy a file” due to the settings of both the phone and the computer.

Methods of accelerating transmission:

• 🚀 Use the port. USB 3.0 (blue connector on PC and cable USB 3.1 Type-C. Speed will increase with 40 MB/s 80-120 MB/s.
• 📶 Turn it off. Wi-Fi/Mobile data on the phone during copying - background synchronization slows down USB.
• 🔄 Switch to mode. PTP, If you only send photos/video, it is more stable. MTP large-file.
• 🛠️ Disable antivirus on your PC (for example, Avast or Kaspersky can block the antivirus). MTP-linkage).

If the files are not copied with the error "Device is not responding":

1. Restart the phone and PC.
2. In Windows Device Manager, remove the Redmi Note 9 driver and connect again.
3. On the phone, perform Settings → Memory → Clear the cache for the Storage application.
4. Try an alternative file manager on PC, like Total Commander or Double Commander, which works better with MTP.

💡

If you need to transfer large files (video, backups), use a local Wi-Fi network instead of using a large file. USB. Put it on the phone. FX File Explorer or Solid Explorer, activate them FTP-server, and connect to the phone through IP-address in Windows Explorer (ftp://192.168.x.x).

Alternative ways to connect without USB

If USB-Connection is impossible (broken port, no cable) or bugs are constantly occurring, consider wireless alternatives. Xiaomi Redmi Note 9 supports multiple protocols for data sharing:

• 🌐 Mi Drop (embedded software) – transfer files over Wi-Fi Direct between Xiaomi devices.
• 📤 FTP over the local network – access to the phone files as a network drive (requires applications) FX File Explorer).
• ☁️ Cloud services – Mi Cloud, Google Drive or Telegram (channels/saved messages).
• 🔗 USB-OTG + flash drive – copying files to an external drive with subsequent connection to a PC.

To set up FTP-phone-server:

1. Install FX File Explorer from Google Play.
2. Open the side menu. → "Network storage" → "FTP-server".
3. Press "Run" and write it down. IP-address (e.g, ftp://192.168.1.100:2221).
4. On PC, open Explorer and enter the address in the address bar.

⚠️ Attention: When in use FTP-Disable Traffic Savings in the phone's Wi-Fi settings. Otherwise, the connection will break through 5-10 minutes of inactivity.

Frequent mistakes and their solutions

Even after you set it up properly, Redmi Note 9 users face specific problems, and we've collected some of the most common cases and ways to fix them:

If none of the methods worked, reset the USB settings on your phone:

1. Go to Settings → System → Resetting settings.
2. Select "Reset USB settings".
3. Confirm the action and restart the device.

💡

On the Redmi Note 9 with MIUI 14+ post-discharge USB-settings automatically turn on Charging Only mode. Remember to manually select File Transfer the next time you connect!

FAQ: Answers to popular questions