You can change it back to "Normal" using the SmozRom, however the ratings will be really whacked as the person who made the rom with "abnormal" ratings changed it from a 0-6 rating to a 0-15. So changing the rom back you will still have players rated above 6 in many categories causing what I would think is a nightmarish situation.
What roms are you working with?
What is your goal?
Also, NOSE shows you the correlating normal values of the ratings when using the abnormal ratings.