Qualcomm HS-USB PCUI 9026 (COM4) Driver

The Qualcomm HS-USB PCUI 9026 (COM4) driver helps Windows recognize the USB-connected PCUI interface and make it available to compatible software through a serial COM port. Listed under Qualcomm Atheros in the USB category, this interface may require a driver if it appears as an unknown device, shows a warning in Device Manager, or cannot communicate with your device-management software.

Key Features

• USB interface recognition: Allows Windows to identify the Qualcomm HS-USB PCUI interface when the matching driver package is installed.
• Serial communication support: Makes the interface accessible through a COM port for supported management or diagnostic applications. COM4 is the assigned port in this device name; the number can differ between computers.
• Legacy Windows compatibility: Listed operating systems include Windows 10, 8.1, 7, Vista, and XP. Check the individual package for supported editions and 32-bit or 64-bit architecture.
• Targeted troubleshooting: Installing the correct driver can resolve missing-driver errors and restore access to the interface when driver configuration is the cause.

How to Install Qualcomm HS-USB PCUI 9026 (COM4) Driver

1. Check your system and device. Confirm your Windows version and architecture. In Device Manager, open the device’s Properties and check Details > Hardware Ids to help identify a matching package.
2. Choose a compatible package. Before starting a Qualcomm HS-USB PCUI 9026 (COM4) driver download for Windows, verify its source, hardware match, and operating-system support. A free download should still be checked for authenticity.
3. Extract or run the installer. Unzip the downloaded archive if necessary. If the package includes a trusted setup program, run it and follow the prompts.
4. Install manually if needed. Open Device Manager, right-click the affected interface, and select Update driver or the equivalent option in your Windows version. Browse to the extracted driver folder and complete the installation.
5. Verify the connection. Restart if prompted, reconnect the USB device, and check that the interface appears without a warning icon. Select its assigned COM port in your compatible application.

Keep the driver updated when a compatible release addresses a problem or adds needed support. The latest version is not automatically the best match for older hardware, so review compatibility before you update. For Windows 10/11 systems, note that Windows 10 is listed as supported here, while Windows 11 compatibility must be confirmed separately with the package provider.