You cannot simply "download" a working kv.bin for free from a public site, as these files must be unique to remain unbanned.
If you want to play Xbox 360 games online safely today, buy a used stock console for cheap. The days of simple KV unbanning are largely over thanks to Microsoft’s detection updates (Stealth servers help, but they aren't magic). download kv.bin xbox 360
Legitimate users never touch this file. However, in the modding scene, users download the kv.bin for two main reasons: You cannot simply "download" a working kv