GoKawiilJailbroken PS5s can play PS2 discs but lose PSN access on older firmware
A public jailbreak called Relapse enables PlayStation 5 consoles on firmware up to version 13.60 to play PS2 discs, but applying it blocks future firmware updates and there is no way to downgrade. Sony has reportedly begun blocking PlayStation Network sign-ins for consoles running firmware older than 14.10, meaning jailbroken PS5s lose access to online multiplayer, the PlayStation Store and new games requiring newer firmware.