Convert complete generic model to specific categories

Hi there, I get some kind of complete revit model which is converted in generic, I don’t know how but the company that was working on that model changed it completely to generic model - so every model element from wall, floor, pipe and all loadable element are converted to the generic elements, which is kind of painful to start modeling from the scratch… So my question would be is it manageable to get back all these categories, or convert it in any way. Thank you a lot!