The Broadcom BCM440x driver allows Windows to communicate with your Broadcom wired network adapter, enabling Ethernet connections to a router, switch, or local network. Installing a compatible driver can help restore a missing network connection or resolve an adapter warning in Device Manager.

Key Features

• Wired network connectivity: Provides the software interface needed for the BCM440x adapter to send and receive data over Ethernet.
• Adapter identification: Helps Windows recognize supported Broadcom BCM440x hardware and display it under Network adapters in Device Manager.
• Network configuration support: Works with Windows networking tools so you can configure IP settings, check connection status, and troubleshoot connectivity.
• Hardware-specific operation: Supports the adapter’s networking functions when the driver package matches its hardware ID and your Windows version.

How to Install

1. Identify your adapter and Windows version. Open Device Manager and locate the Broadcom BCM440x under Network adapters. If it appears as an unknown Ethernet controller, open Properties > Details > Hardware Ids to confirm the hardware. Also check whether Windows is 32-bit or 64-bit.

1. Check package compatibility before downloading. For Windows 11, 10, 8, or 7, choose a driver explicitly compatible with your operating system and adapter. The BCM440x is older hardware, so a package intended for an earlier Windows release may not support newer versions. A listed download does not by itself confirm compatibility.

1. Save and extract the driver files. If this PC has no working internet connection, download the package on another computer and transfer it using a USB drive. Extract compressed files to a folder you can easily find.

1. Install the matching driver. Run the included installer if available. Otherwise, right-click the adapter in Device Manager, select Update driver, choose the option to browse your computer, and point Windows to the extracted folder. Do not force installation if Windows reports that the driver is incompatible.

1. Restart and test the connection. After installation, restart if prompted, connect an Ethernet cable, and check the adapter’s status in Device Manager. If connectivity still fails, verify the cable, router port, and IP settings before trying a different driver.

Common Issues and Fixes

• Install fails or rolls back: Run the installer as administrator and in Windows 7 compatibility mode; if it still fails, use Device Manager > Update driver > Browse my computer and point to the extracted INF file. Temporarily disable antivirus/security software.
• Device not detected: Check Device Manager for an unknown “Ethernet Controller” under Other devices. Reseat the PCI card or try another slot; enable onboard LAN in BIOS if using integrated BCM440x; confirm the adapter is not disabled.
• Version conflicts/Windows Update overwrites: Remove any existing Broadcom/OEM NIC driver in Device Manager (check “Delete driver software”), reboot, then install the correct 32/64-bit BCM440x package. If Windows Update replaces it, roll back via adapter Properties > Driver > Roll Back Driver.