I don't know a lot about the advanced NAND donor stuff but I think you can still get the console working. If your KV is corrupted, you will need a donor KV and the CPU key that originally went with that KV. Let's call this a "donor cpu key" as opposed to the hardware key burned in the fuses.
You can build a new nand with donor files using the donor KV and use the donor CPU key when building freeboot. AFAIK you don't use the hardware cpu key for anything anymore.
l_oliveira and cory1492 have posted a lot of explanations and help in this thread
http://www.xboxhacke...18707#msg118707and the discussion gets more detailed around here
http://www.xboxhacke...19625#msg119625See if that gets you going.