Qualcomm HS-USB Diagnostics 9091 (COM429) Driver

The Qualcomm HS-USB Diagnostics 9091 (COM429) driver helps Windows recognize a compatible Qualcomm-based device’s USB diagnostic interface and make it available to diagnostic software through a COM port. Listed under Qualcomm Atheros in the USB category, this driver is intended for technicians, developers, and users who need diagnostic connectivity rather than ordinary USB file transfer.

Key Features

• Diagnostic interface recognition: Enables Windows to identify the supported HS-USB Diagnostics interface instead of leaving it as an unknown device.
• COM-port access: Allows compatible service and diagnostic applications to communicate with the connected device. COM429 is the assigned port label; the number may differ on another computer.
• 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• Driver maintenance: Installing a compatible update may help resolve recognition or connection issues caused by an outdated or incorrectly installed driver.

How to Install Qualcomm HS-USB Diagnostics 9091 (COM429) Driver

1. Check the device and operating system. Open Device Manager, locate the diagnostic interface, and check its hardware IDs under Properties > Details. Confirm your Windows version and system architecture before choosing a package.
2. Select a compatible package. Before starting your Qualcomm HS-USB Diagnostics 9091 (COM429) driver download for Windows, verify that the package supports your hardware IDs and OS. For a free download, use a trusted source and check the publisher’s information.
3. Extract and install. Unpack the downloaded archive if necessary. Run the supplied installer, or select Update driver in Device Manager and browse to the extracted driver folder.
4. Reconnect the device. Follow any device-specific instructions for enabling its diagnostic interface, then reconnect the USB cable. Restart Windows if the installer requests it.
5. Verify recognition. Check that the interface appears without a warning icon in Device Manager, typically under Ports (COM & LPT). Select its assigned COM port in your compatible diagnostic application.

Keep the driver updated when a compatible release addresses a problem or adds needed support; the latest version is not necessarily suitable for every older device. For Windows 10/11 systems, verify support separately: Windows 10 is listed for this device, but Windows 11 compatibility is not confirmed. Avoid forcing an unsupported package or disabling Windows security checks to install it.