I would try PowerStrip (if using Windows) and force a custom modeline.  The EDID with my Samsung TV is returning an invalid set of timings, but I was able to override them.  I would copy the timings using one of the 4k monitors that works.

I’m on a macbook, so I can’t be more specific. 

Hopefully they will get the firmware EDID stuff worked out further.  I’m sure the challenge is substantial.