OEM Unlock Missing?

To enable custom firmware on Android mobiles, you need an unlocked boot loader. Samsung have always had the OEM Unlock option in the hidden Developer Options menu (About Phone / Software / Build Number / Tap 5 times then press back arrow twice). With Android 8, Oreo, OEM Unlock isn’t immediately available. Don’t panic, chill out & wait. Wait for a week, without restarting your phone. After 168 hours Up time (About Phone / Status) the missing OEM Unlock option will appear. Now you can do your Rooting/Recovery/Firmware.