You will be need a boot loader unlocked custom recovery installed device toFlash Samsung Galaxy S8 Custom Rom LightRom (SM-G950F/FD/N) (Oreo 8.0 ) Stable)
You will be needing a bootloader unlocked and custom recovery installed device to flash Samsung Galaxy S8 Custom Rom LightRom (SM-G950F/FD/N) (Oreo 8.0) (Stable).