This same thing happened to
This same thing happened to me. I have a 2020 Legacy. I did the 'over the air' update and followed the directions to a tee. It said the upload failed so I attempted it again but then the entire system went black. It only works when I use my back up camera. I can't control anything - no radio, no climate control, nothing that gets controlled from the infotainment center works right now. I called Subaru of America and they told me to take it to the dealer to have the computer re-set. They said they released it with a glitch and are now receiving many calls similar to mine. I'm going tonight and hopefully they can fix it. It's torture to not be able to change the air conditioning or heat... or to be able to listen to the radio. I'm so disappointed. I came to this article to see if anyone had a similar experience and found a solution - doesn't seem like it though.