The PS5 Pro can boost the graphics and frame rates of PS5 games that have been enhanced for the console. However, the console can also give a modest visual boost to PS4 titles, as well.

Last year I bought some games from PSN for my PS4. Then my PS4 died and I bought a PS5 to replace it. I want to play those PS4 games I bought from PSN on my PS5, but they don't show up.