i have a buddy with a 2000 7.3. i am trying to install the edge evolution into his truck. after hooking everything up i tried to download the tow level. i did everything it said to do and had " clearin checksum file" pop up. after that i got this: "file missing:vnablnb update required" i have already updated the programer and tried this again and got the same resluts. the truck is still drivable. any suggestions???