You will want to first relock your bootloader, then use RUU to get back to stock. JeepFreek has written a nice tutorial on how to use RUU on a mac.
Your bootloader will say "Relocked" ins...
So I did the exact same thing as many others. I ran the script more then once and wiped out my IMEI number.
I have put together a fix that may help you restore some of what have been lost. This is a modification of the original script left us ...