Blaupunkt 4k LED TV as external monitor for MBP mid 2012 retina issue

I initially connected the MBP 2012 retina 2.7 GHZ to the 4k display it showed me 3840x2160 correctly. But when I was optimising some display settings I changed to 1080p after that I no longer get the 3840x2160 option at all.Yet I could still load into my Windows with the 4k at 30 hz. It would be great to know how can get the 3840x2160 resolution option back.

It would be interesting if anyone could tell me if they have successfully shot upon 4K with 60 hz on mid MCP retina. If so would be great to know how you accomplished it.