Playing content at 4K60 on my A/V Binloop Uncompressed system.

In order to play content at 4K resolution 60 fps your controller firmware should be 2.33 or later, and all Repro2KU cards under firmware 1.11.
Then go to your AVUC sub menu and select A/V Setup choose NTSC 30/60 once set; go to each Repro Setup and pick 2KP60.
At this point your system is ready to playback video at 4K60.