Update 10/10/21: I was able to rip the dash of my Prius apart this last weekend and pull out the unit and replace the SD card.
I found out the hard way that the 4500 is different than the 4400 when dismantling—the video posted here helped a lot though. I had to improvise a bit and I removed the ribbon cable from the DVD unit at the motherboard—it was easier than from the unit. Also, I wasn’t able to slide out the display mount easily, so I decided not to force it.
Instead, I popped the clips of the surrounding plastic frame and the ribbon cable was connected to the board was