Save a copy of what you filed. Then you can go in and amend the state program to get to Detroit city return. You can mail it in definitely. MI will allow you to efile an amended return so you should be able to efile.
Personally, I think I would amend to get the Detroit correct, then mail it in with tracking to ensure safe arrival and not mess with the state return.
@tree2007 Good luck and you are very welcome!
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