BCM20702A0 Dell drivers for Windows 8.1 [SOLVED!]
Q. Hello, I have a Dell laptop running a clean install of Windows 8.1 but I have an Unknown Device ‘BCM20702A0’… do you know what driver I can download to to fix it? A. Here is the download link for the driver that should solve your BCM20702A0 Unknown Device issue: mirror (to be added), Dell dl link  Supported Laptop/Notebook models: Systems Latitude E5420 Latitude E5430 Latitude E5520 Latitude E5530 Latitude E6220 Latitude E6230 Latitude E6320 Latitude E6330 Latitude E6420