Realterm Samsung phone help

I’ve been trying to use to Realterm Samsung unlock way of unlocking my phones. I can’t seem to get past the point of entering the first code.
After I enter the first code, it just repeats the code in green. I never get an "Okay" or anything. I have the sim card in it and have tried with it out.
I’m downgraded firmware and upgraded.

What could I be doing wrong, I can’t seem to get help on this issue.