Qualcomm HS-USB Android DIAG 901D (COM9) Driver

The Qualcomm HS-USB Android DIAG 901D (COM9) driver lets Windows recognize the diagnostic USB interface on compatible Qualcomm-based Android devices and expose it as a serial COM port. Listed under Qualcomm Atheros in the USB category, this driver is intended for technicians, developers, and users who need a diagnostic connection for compatible servicing or troubleshooting tools.

Key Features

• Diagnostic USB connectivity: Enables supported software to communicate with the device’s diagnostic interface when that interface is available and enabled.
• COM-port recognition: Helps Windows identify the diagnostic connection in Device Manager. COM9 is the assigned port in this device name; another computer may assign a different number.
• Legacy Windows support: Listed operating systems include Windows 10, 8.1, 7, Vista, and XP. Choose a package that matches your Windows version and 32-bit or 64-bit architecture.
• Driver troubleshooting: Installing a compatible package may resolve missing-driver warnings or an unrecognized diagnostic interface. It does not replace standard Android USB, MTP, or ADB drivers.

How to Install Qualcomm HS-USB Android DIAG 901D (COM9) Driver

1. Check compatibility. Confirm your Windows edition and system architecture. If comparing Windows 10/11 compatibility, note that Windows 11 is not included in the listed supported operating systems; verify explicit support before proceeding.
2. Choose the correct package. Before starting your Qualcomm HS-USB Android DIAG 901D (COM9) driver download for Windows, check the package’s supported hardware and publisher information. For any free download, use a trusted source and scan the files before opening them.
3. Prepare the connection. Extract the downloaded archive if necessary. Connect the Android device using a reliable USB data cable, and follow its manufacturer’s instructions to enable the diagnostic interface if required.
4. Install the driver. Run the included installer, if provided. Alternatively, open Device Manager, locate the diagnostic interface or unknown device, select Update driver, and browse to the extracted driver folder.
5. Verify detection. Reconnect the device or restart Windows if prompted. Check that the interface appears without a warning icon, then select its assigned COM port in your compatible diagnostic application.

Keep the driver updated when a trusted, compatible release addresses a connection issue or adds needed support. Check that the latest version still supports your hardware and operating system before you update; a newer package is not automatically a better match for older Windows installations.