Is it possible to recover yield maps from a JD brown box controller in an older JD combine?

First, to my knowledge you will need an old verse of JD office that has not been updated! There needs to be a auto track card in the box for it to auto steer. Any John Deere receiver should work with the brown box. I don’t think you can use RTK with a brown box. John Deere dealer should be able to help you.