Originally Posted by
dusoo ok, im stuck for good, or someone is trying to solve this out ?
Isn't there even chance somehow to unlock it by using AT&T sim card?
i know that these are really desperate questions

There is no current unlock. As 4.0 is "around the corner" I don't expect anyone is working on an unlock for 3.1.3 anymore either.
No, you can't unlock with that firmware and that bootloader AT ALL, it doesn't matter if you have an AT&T sim card or not, you need to use it on the AT&T network or not at all.