GNU/Linux Elementary OS 5 Installing Broadcom Driver without Internet
Hi! The Tutorial shows you Step-by-Step How to Install Broadcom Wireless Driver in Elementary OS 5.x LTS without Internet Access.
Most noteworthy: to achieve this Setup you simply need any Online Computer with a Browser and a USB Stick to Copy the downloaded Packages.
But if you dispose of an Android Mobile Phone with Internet Acces, then an Easier Solution should be of using it! See: Internet Connection USB Tethering Guide.
Especially relevant: the Elementary OS 5 bcmwl-kernel-source Driver Supports the following Broadcom Wireless Chipsets:
Finally, for BCM4306, BCM4309, and BCM4318 see instead: B43 Wireless Driver.
GNU/Linux Elementary OS Broadcom Wireless Driver Installation