It baffles me because the admin console doesn't look like it will browse your computer for a firmware update. Rather, it prefers you to specify a tftp or http server. I don't know how I'd set up my computer to be the http or tftp server and it doesn't really go into detail on what configurations or commands that would need to be used.
I've used a tftp client in the past to send a firmware to routers and whatnot but not serve one