change color of a block in a file exported by archicad 15 in autocad 2007

[Giovannino60]

Hello, I converted a file of archicad 15 in autocad, but how do I change the color of the plugs, for the press, if clicking on it does not result a retino but a block without name. Of course I don't want to explode all the plugs. I attach the file.View attachment Pennino tetto.zipThank you.