Lumia black update help please


Hi guys,
I've a lumia 720 and I wish to update it to latest black. The problem is I don't have a wifi or 3g. Previously for the amber update I used nokia NSU retail software. But it is not showing any new updates now. Still showing the same firmware (1334.0001 or something like that). I have a fast lan internet so I can connect my phone and update it if there's a way to do that. Any help is appreciated. Thank you
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