@kalyan its the DRM and this is why you are not getting 4k netflix in your TV. and the support says your TV needs to have play store for netflix 4k ? and this is not entirely true. My Vu TV doesn't have play store but it displays netflix 4k HDR without any issues. Its the DRM and my Vu tv OS is opera and my opera Vu HDR tv has the proper DRM so it displays netflix in 4k HDR without any issues.
A HDCP compliant 4in1 input before your TV input.
DRM appears to be a software issue, might require a compliant hardware (which your TV as you say already has).... so it comes down to the bad smart OS in your Smart TV.... forcing you to buy another smart device...My TV support HDCP 2.2(Ordered Fire Stick 4K and waiting...), but I am not sure DRM is support or not.