BMW E61 525D 2005 bad ECU (no start, transmission fault, fuel pump failure).

This car died after a car wash. It turns out that the ECU managed to get water, because the cabin filter housing was broken, which I will still need to replace, but for now I got a plastic bag over the ECU box. At first I tried to clean the contacts to at hopes of bringing the ECU back to life, but it was to far gone, so I ended up getting another ECU and took it to a guy so he could tie it, but unfortunately ho couldn't get any reading from the old ECU so he couldn't get it to work. So I contacted another gay, and he said to bring the new ECU and to take out the CAS module so he could program it. He did made it work, but once I put them back on the car I had to synchronize them with my OBD II computer and as you can see the car started.