Just select the LAlt+Num8 option to unlock. Since the trainer is in Chinese I don’t know what the other options do.
Anyway, here’s some gameplay with Nero on Floors 1-20. It’s a bit sloppy in some areas, especially the parts where I try to input Maximum Bet but doesn’t come out (I have the Attack set to Y and Devil Breaker set to RB so pressing both at the same while holding lock-on and back is harder than Y+B at the same time since those are close together).
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