Why am I unable to select any options in Download Mode?

I have a SM-G920T that is stuck on the Warning logo for Odin/Download mode. I need to get this unit back to the stock OS it was on. It was rooted and loaded with a ROM that is missing it's recovery. But for the life of me, I am unable to get past the warning screen to get into Odin mode. I can go into recovery and wipe, cache, factory reset (Which resulted in the phone being a bootloop issue now) and use the buttons like normal. My main problem to solve all it's other problem is I just can't toggle the buttons to get when I am in the blue Odin interface asking to select continue or Cancel. Any help would be appreciated. Thank you.