I was born in Country X in 80s and my parents moved to country Y (distance between towns were within 200 KM). That time, we were not aware about birth certificate. When I applied passport, I mentioned my place of birth as our current residence and since I was citizen of country Y, I hold country Y passport.
Now, we know the relatives where I was born and also got the birth certificate from Country X (my original birth country). How can I update my place of birth on I140?