IMAC 27" issue when use as external display

I just boought an IMAC 27 inches, I have an issue using it as external display for my macbook pro. both machines support thunderbolt. The issue is not connecting it  from my macbook pro to IMAC, but when I want to release and use my IMAC again as computer by clicking CMD F2, the connection did not get released. I tested using IMAC at apple store and it works fine. I can connect and disconnect using CMD F2. finally I checked the thunderbolt firmware in my IMAC and compare with the one at Apple store. They  are not the same. the one I have is Port Micro Firmware Version:          2.1.1 and the one at Apple strore is Port Micro Firmware Version:          2.0.7. is there any fixed?

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