I keep misunderstanding this use of a question mark following “or” ! 
Maybe you should scroll though the 3 booting modes and see what you have ?
Do you stll have a regular unmodified Samsung Android ? Further evidence of this would be
CURRENT BINARY: Samsung Official
Is this what you see ?
If yes to the above, you maybe uploaded the custom recovery, but failed to boot into it with the right timing … as in Your first boot into TWRP
My understanding was that he wisely did this on his unmodified phone and you wisely did the same.