(adsbygoogle = window.adsbygoogle || []).push({}); How can i make an Black Ops 15 Prestige Acc with an USB?

You can't. Just get a modder to do a recovery for you. Pay for one or try to find someone that might do it free. Don't try to mod any game on OFW.

I tought it weren't dangerous with just an USB cause i ain't really have an Mod Lobby or something like that

If it was online you are still breaking TOS, so you are taking risk. But as he said just get a recovery. I sell for $10. Prestige, Rank, Unlocks, Godmode, Overkill.