I have the updates for the 997 and the matrix on the sd card. Because I have already put the updates on the units, it won't ask if I would like to update to the newer version. I don't have an older update on the card. Is there some place I can find an older version of the update for both units? So I can download the old version to be able to turn around and re-download the latest update, this time after restoring defaults.