Common workaround: add a wired network connection temporarily during the install, then fix the necessary wireless network setup later. Of course, this only works if the laptop has a wired network interface.
I'm installing FreeBSD 12.1 in a laptop, and when the installation prompts to configure the network (IPv4/IPv6), no adapter appears.
I entered another tty (Alt+F4) and run ifconfig, where only lo0 device shows up. Any idea on how to make it recognize the WiFi card?