honestly i have no idea,but out of curiosity.why are you wanting it set back to stock?i had the pandora rom installed on mine,and it run good.in fact the new owner loves the thing.
I agree it is a pretty good rom but I would like to reset to factory and do some of my own experimenting with rooting and making changes to the original rom. I am hoping maybe someone has a copy of the original rom that they would upload or give me a link where I could find it.