I need a ecm
 

I own an Audi a6 quatro ..it's a 2000 tothat come stock with the 2.8 but has had an engine swap for the 4.2.. it rained and my ecm got wet and now I have a crank no start issue and the damn ecm won't communicate... Audi flashes ecms to the VIN of the car so I can't take it to them .what do I do. I need to replace the ecm but how do I get one to work in my car