You should find the guy who told you to downgrade from 4.2 to 3.2, then upgrade to 4.1- when you find him, kick his ass. There is only one possible outcome from what you have done. As you have found, that outcome is a full brick, which is exactly what should have happened in the process you followed.
Sorry to say, but there is nothing you can do to fix this brick.
If you have a nand dump you could use a nand programmer to reprogram the nand.