LEDE/OpenWRT — Using Raspberry Pi As Firewall

I’m a bit mystified as to how I install the USB drivers. I am connected to my RPi via RJ45 to the single NIC of the RPi/LEDE (LAN). So far, so good. And I have my USB-ethernet adapter plugged into the RPi (WAN). But how do I update the software lists, as my WAN isn’t functional yet? I am having trouble understanding how you update, when there is no internet access…

One clap, two clap, three clap, forty?

By clapping more or less, you can signal to us which stories really stand out.