Hello! You can actually do this on your own. Got to https://www.subaru.com/owners/index.html?navigation=true and have your VIN ready. That will allow you to download the most recent update. You then will have to copy that file onto a SD Card (Not thumbdrive unfortunately). Your radio should have a SD Card insert that has a rubber cover that hinges open. Insert the SD Card into the radio and the update will start.
If you have not had an"update" in awhile it must definitely can and needs to be done. If you want to swap out for a newer until I'm sure they can help you.
Thanks! Your answer is awaiting moderation.