unless you downloaded the NXE leak, and haven't upgraded to the full nonleak NXE yet, I don't think there is a way to revert back.
:
1- Go to your Xbox 360 and tell her everything is going to be OK and then select - system - memory - - hard drive.
2- Now press Y which brings you to "rename" then press X,X,LB,RB,X,X then answer "yes" to the following question concerning "Do you want to perform..."
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do that to flush the memory to restore the erm, I think the first 360 firmware. I'm pretty sure that works with the NXE leak and any other previous versions of the 360 dashboard.
not my explanation