Qualcomm HS-USB Diagnostics 9001 (COM31) Driver

The Qualcomm HS-USB Diagnostics 9001 (COM31) driver helps Windows recognize the diagnostic USB interface exposed by compatible Qualcomm-based hardware and makes it available to supported service tools. Listed under Qualcomm Atheros in the USB category, this device is typically relevant to technicians, developers, and users troubleshooting a connected phone, modem, or other compatible device.

Key Features

• Diagnostic interface access: Enables compatible diagnostic software to communicate with the device through a Windows serial-port interface.
• Device recognition: Helps resolve missing-driver warnings when the connected hardware exposes the matching Qualcomm HS-USB Diagnostics interface.
• COM-port communication: Supports access through the assigned COM port. COM31 is the current Windows port assignment, not a separate hardware model, and may change after reconnection or installation.
• Windows compatibility: Driver packages for this interface may support Windows 10, 8.1, 7, Vista, and XP. Choose a package that explicitly matches your operating system and its 32-bit or 64-bit architecture.

How to Install Qualcomm HS-USB Diagnostics 9001 (COM31) Driver

1. Confirm the device identity. Open Device Manager and locate the diagnostic interface, which may appear under Ports (COM & LPT) or Other devices. Check Properties > Details > Hardware Ids to verify that the package supports your hardware.
2. Choose a compatible package. Before starting your Qualcomm HS-USB Diagnostics 9001 (COM31) driver download for Windows, review the listed operating systems, architecture, and source. Prefer the hardware manufacturer’s package where available. A free download should still be checked for authenticity and compatibility.
3. Prepare the files. Extract the downloaded archive if necessary. Connect the device with a reliable USB data cable and follow its manufacturer’s instructions for exposing the diagnostic interface.
4. Install the driver. Run the supplied installer, or right-click the device in Device Manager, select Update driver, and browse to the extracted driver folder. Avoid bypassing Windows security checks to force an incompatible package.
5. Verify recognition. Restart if prompted, then check that Device Manager shows the interface without a warning icon. Select its assigned COM port in your compatible diagnostic application.

Keep the driver updated when your device manufacturer provides a relevant fix or compatibility improvement. The latest version is useful only when it supports your hardware and Windows release. For Windows 10/11 systems, check support separately: Windows 10 compatibility does not establish Windows 11 support, and Windows 11 is not included in this device’s listed supported operating systems.