How do you do a software update without WiFi

Welcome, emori256, to Apple Support Communities.

You wish to know how to do a software update without WiFi.

Is this about an iOS update on an iPhone, or something like that?

Well. While you cannot use cellular for an iOS update, even through an iPhone hotspot, you can use a computer (PC or Mac using iTunes, or Mac running Catalina, using the Finder) with an internet connection.

Is that of any help to you?

If you are referring to iOS update then you can't.

Alternatively you can use your Laptop connected to LAN