Ok, I had the same thing happen when i tried to revert mine to RC29, first attempt to flash failed, second attempt failed, so i thought hmm not good, maybe i had a bad download, so I went over to XDA and downloaded it again FROM A DIFFERENT LINK copied to the sd card and flash went perfectly!
now i wonder though you said you tried to go back to RC30 how? there has not been a .nbh image leaked of RC30 to my knowldge only the RC29 image that was leaked.
in any event download a new copy of the image and try it, your phone is not bricked
EDIT:
guide on how to do it is here http://forum.xda-developers.com/showthread.php?t=442480
there is a link to the image file there as well

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