Name mistake in I-485 Receipt
My first name was spelled wrong in my I-485 receipt and also in EAD.
Called the IIO, they asked me to write to them and send the copy of the birth certificate. Did the same and everything got changed. When I received the FP notice my names have been corrected.
I would suggest you to call the INS office first and tell them the mistake. If they are not chaning over the phone, most probably they would request you to send the Birth Certificate as I did.
Hope this helps you.