It is indeed ;debugOn => ~usbNetwork => ;debugOff on the K4 (and, yeah, you enter with the 'Enter' virtual key, NOT the 'Done' one)
Unless you enabled verbose mode, nope, there won't be any feedback (except maybe the battery icon switching to the 'charging' icon for a short while).
If you're using the latest version, USE_VOLUMD should default to true by default on the K4
That leaves us with the first answers you were given: check your network settings, and use the appropriate IPs. (The defaults are what's written in the doc).