I feel the need to sort this in my head. You bought a car, and felt JFONZ owed that car a tune, but you did not buy the Jfonz tune then JFONZ sent you a tune which bricked your ecu and that was ok for roughly 2 years. Then you bought a DAZ tune, but based on the timeline I have drawn on my white board you were very close to being able to tune it yourself at this point. Anyhow now you wish to recover the bricked ecu, which I guess is maybe the only part of this story I understand and you want me to believe that you have read this forum and could tune your own stage 2 but cannot get a ecu into bootmode.
If this is in fact what has happened, and you just come out and say it I will help you get this ecu into boot mode right now!
This is correct, however the issue is the ECU is fried. There is nothing i can do