The ECM is not "bricked" that I can guarantee as you haven't changed anything within the programming. It seems as though you have something else going on. You did check the cigarette lighter fuse right?
Do this it will work...
1.Turn key to the run position and leave it there
2.In the under hood fuse block pull the ECM/PCM fuse
3.Reinstall the same fuse
4.Leave the key in the run position and full flash the ECM boom.
If its an 04.5 and you dont have the stock file PM me
ALSO... 5-6 years ago I bought Haisleys 3 part additive $150 if I remember correctly it came with a gallon of "Cetane" and 1 lubrication additive that was petrol based and one that was soy based.
Humor me and try what I said in my first post. I have had 4 or 5 LLY ECM's get "stuck" in an unrecognizable state. Unplugging the ECM fuse with the key on then plugging the fuse back in fixed it every time