Fine ill help you. Since your so nice about it.
Ill even highlight.
1) There is no such thing as 3.20, so there is no such thing as 3.20 OE-A and there never will be.
2) Thinking that you can downgrade with a Custom Firmware is completely retarded. Not only that, but there is no way at all to even downgrade 3.30.
3) ISO talk on this forum is completely forbidden. Please go to hell.