The computer does not see the Xiaomi Redmi 3S through USB: Complete guide to diagnosis and repair

Xiaomi Redmi is connected 3S computer-to-computer USB, This problem is familiar to many owners of Xiaomi smartphones, especially on older models like Redmi. 3S (70% of the time, faulty cable, outdated drivers or incorrect settings are to blame. MIUI. But sometimes the reason lies deeper - in hardware malfunctions of the port or firmware.

In this article, we will discuss all the possible reasons why your computer does not see Xiaomi Redmi. 3S through USB, — from the common (contaminated connector) to the complex (damaged board) USB-You'll get step-by-step picture instructions, diagnostic checklists, and cable compatibility tables, and if the firmware is a problem, we'll tell you how to turn on Debugging. USB even on a locked phone.

Important: Redmi 3S It runs on a Qualcomm Snapdragon 430 processor and has unique connectivity features. MTP In default charging mode, you need to activate it manually. Read more about this and other nuances below.

1. Checking physical connections: cable, port and connector

Start with the simplest thing, check the cable and the ports. 30 percent of the time, this is where the problem lies. 3S It uses a Micro-USB connector, which eventually wobbles or oxidizes, and cheap cables often have damaged veins for data transmission (only power is left). +5V land GND).

Here's what we need to do:

• 🔌 Try another one. USB-Cable (preferably original from Xiaomi or certified) USB Avoid "charge" cables without slapping - they often do not transmit data.
• 💻 Connect the phone to another USB-The ports on the front of the system unit often have a weak contact.
• 📱 Check the Micro-USB connector on your phone with a flashlight. If you see foreign objects, oxidation, or bent contacts, clean them carefully with a wooden toothpick (not metal objects!).
• 🔄 Turn over the cable and try to connect on the other side (sometimes the contacts wear out unevenly).

If the computer does not see Redmi after this manipulation 3S, You can move on to the next step, but first check if the phone is charging, if it's, it's more software-based. If it's not, it's probably damaged. USB-port on a phone or PC motherboard.

2. Settings USB Xiaomi Redmi 3S: turn on the file transfer mode

Redmi 3S The default mode is to connect to the computer in Charge Only mode. To transfer files, you need to manually select File Transfer mode (MTP) or PTP. Here's how to do it:

1. Connect the phone to the computer.
2. Unlock the Redmi screen 3S (Important! without unlocking the menu USB will not).
3. Swipe down the notification bar and find the USB option to transfer files (or Charge via USB).
4. Tap on the notification and select File Transfer (MTP).

If no notice appears:

• 🔧 Go to Settings. → Additionally. → Developer Mode (if not, activate by pressing the Version 7 times) MIUI phone).
• 🔧 Turn on Debugging. USB and select the configuration. USB default → MTP.
• 🔄 Reconnect the cable.

Phone screen unlocked|Regime on. MTP/PTP|Debugging activated USB (if necessary)|I tried different things. USB-regimes-->

If after these actions the computer still can not see the phone, the problem may be in the drivers on the PC or in the firmware Redmi. 3S. This is discussed in the following sections.

3. Installation and update drivers for Xiaomi Redmi 3S

Without the right drivers, Windows won’t be able to recognize Redmi 3S It's like a storage device. It's most common for Windows to have a problem. 7/10, where drivers for Qualcomm devices are not installed correctly:

Method 1: Automatic installation via Device Manager

1. Get Redmi on board. 3S PC.
2. Open Device Manager (Win + X → Device Manager).
3. Find your Redmi portable devices or other devices in the list 3S (It can be displayed as Qualcomm. HS-USB Diagnostics or with a yellow exclamation mark).
4. Right-click → Update the driver → Automatic search.

Method 2: Manual installation of Qualcomm drivers

If automatic search does not help, download the drivers manually:

• 🔗 Official Qualcomm drivers (choose the version for the Snapdragon 430).
• 🔗 Xiaomi Mi drivers PC Suite (universal for all models).

After installation, restart your computer and reconnect your phone.

Table: Compatibility of drivers with Windows versions

If the drivers are installed, but Redmi 3S still undetected, the problem may be in the phone's firmware or security settings MIUI.

4. Firmware problems and MIUI: resetting and debugging

Sometimes firmware failures MIUI block USB-This can happen after you update, reset or install custom firmware:

Resetting USB settings

Go to Settings. → System system → Resetting settings → Reset the network settings. That'll bring back the settings. USB factory-wise.

Initiation of debugging USB (If the phone is not determined)

If Redmi 3S It doesn’t even appear as an unknown device, try it:

1. Activate Developer Mode (7 taps according to the MIUI version in About Phone).
2. Enable USB Debugging and OEM Unlock in Settings → Additional → For Developers.
3. Connect your phone to your PC and confirm debugging permission on the Redmi screen 3S.

1. Turn on debugging by USB (If the screen is still working).

2. Connect the phone to the PC and execute the command:

adb tcpip 5555


adb connect [IP- phone address]:5555

You can then manage files via AdB. pull/push physically USB-linkage.-->

Fastboot flashing (extreme case)

If none of these things work, the firmware may be damaged, and then Fastboot flashing will help.

• 🔧 Download the official firmware for Redmi 3S (land code from Xiaomi.
• 🔧 Install Android Platform Tools.
• 🔧 Transfer the phone to Fastboot mode (clip the power supply) + Volume down when the phone is off).
• 🔧 Run the command: fastboot flash all [name firmware].zip

⚠️ Warning: Fastboot flashing erases all data on your phone. If you have important files, try extracting them first through the phone. ADB Or go to the service center.

5. Computer problems: Windows settings and antivirus

Sometimes the computer doesn't see Redmi. 3S Because of your own settings:

Power settings USB

Windows can turn off USB-Power-saving ports. To fix it:

1. Open Device Manager.
2. Find the Controllers. USB → Root USB-hub.
3. Right-click. → Properties → Power management.
4. Uncheck the tick from Allow this device to be turned off to save energy.

Antivirus and firewall

Some antiviruses (for example, Avast, Kaspersky) are blocked. USB-compounds as potentially dangerous:

• 🛡️ Temporarily disable the antivirus and check the connection.
• 🔥 Add adb.exe and fastboot.exe to firewall exceptions.

Conflict with other devices

If several are connected to the computer USB-Devices (e.g. printer, external drive) may conflict. Disable all the extra devices and try to connect Redmi 3S freshly.

💡

If the computer makes the connection sound USB, but the phone doesn't show up in "This Computer," the problem is most likely in the drivers or settings MIUI. If there is no sound, check the cable and ports.

6. Hardware malfunctions: when repairs are needed

If all software methods have been tried, but Redmi 3S It is not yet determined by the USB, The problem may be hardware. Here are the most common malfunctions:

To diagnose a hardware malfunction:

1. Try to connect Redmi. 3S to another computer/laptop.
2. Check if the phone is detected in Fastboot mode (Power) + Loudness down. If yes, the problem is firmware or settings. MIUI. If not, the port is broken.
3. Connect another phone through the same cable to your PC. If it's detected, Redmi's a problem. 3S.

⚠️ Warning: If you are unsure of your soldering skills, don’t try to repair yourself USB-Improper repairs can damage the motherboard, and the cost of repair will rise to 3000-5000 ₽.

7. Alternative ways to transfer files without USB

If USB-The connection never worked, you can transfer files in other ways:

• 🌐 Wi-Fi: Use Mi Drop (built-in) MIUI) Or apps like Send Anywhere. ~5-10 MB/s.
• ☁️ Cloud Services: Upload files to Mi Cloud, Google Drive or Yandex.Disk, then download to PC.
• 📶 FTP-server: Install on the phone FX File Explorer or Solid Explorer, Enable FTP-server and connect via FileZilla.
• 📱 Bluetooth: Slowly (~1 MB/s), but it works without the Internet.
• 🔌 OTG-adapter + Flash drive: Copy files to a flash drive via the Micro-USB adapter → USB-A, Then connect the flash drive to the PC.

For transferring large amounts of data (for example, backup), Wi-Fi Direct or Wi-Fi Direct is best suited. FTP. If you need to copy several files, use Mi Drop:

1. Open Mi Drop on your phone.
2. Select files and click Send.
3. Open drop.xiaomi.com on your PC and enter the code from your phone.

FAQ: Frequent questions about Xiaomi Redmi connection 3S