nuthin_fun

2020 Sierra 2500 AT4. When going to the camera app, or switching to reverse, a black screen with a crossed out camera and a red triangle with an exclamation point inside displays. The camera that displays on the rearview mirror works. I've searched for blown fuses, but can't find any. I've pulled the infotainment fuses and replaced to atempt to reset, and nothing. I even pulled the disconnected the battery as a reset. After I pulled the battery and reconnected, I started the truck and switched to reverse. The camera displayed for a fraction of a second, then went back to the the black screen with symbols. This is the only love I've seen out of it since they stopped working on Friday. Any ideas? Thanks!