CAC-1170: 4k 60Hz Finally working with 2014 15" Retina Macbook Pro and Vizio M50-C1

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I'd like to share how I was able to get my Mac laptop to work at 4K 60 hz with the Vizio M series TV, which has been notoriously difficult to get to play nice.

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I have a 2014 15" Macbook Pro Nvidia 750M 2 GB and a Vizio M50-C1.

Step 1:  Install latest firmware update for CAC-1170 adapter.  Email [email protected] to get the latest firmware. 
Since the firmware installer is an .exe (Windows only), you need to use a Windows laptop with a AMD, Nvidia, or Intel graphics card to install the firmware on the adapter.  I borrowed a friends laptop with a Nvidia GTX970M card to install this firmware.  Follow the instructions in the email from [email protected].

Step 2:  Once the firmware is the ps176b0_0x07.0x00.0x23 version, install SwitchResX on Mac OS X (http://www.madrau.com).

1.  Follow instructions to disable System Integrity Protection (SIP) so that u can install a custom resolution.
2.  Create a custom resolution of 3840 x 2160 at 60 Hz using the Preset "CVT-RB" and simply putting the vertical "scan rate" as 60 hz.
3.  Save this custom resolution
4.  Restart computer to install custom resolution

Step 3:  Once restarted, check in SwitchResX preferences to see if the custom resolution has been installed.  If so, connect Macbook Pro to the M50-C1 (or other M series) to HDMI Port 5 using the CAC- 1170 and HDMI cable (18Gbps capable).  Use SwitchResX to change the resolution to either 1080p @ 60Hz (HIDPI aka Pixel doubled) or 3840 x 2160 @ 60 hz (native res).  Hold your breath and it should let you finally use your Vizio M series at 4k 60hz.  Check refresh rate by using the UFO test (www.testufo.com/#test=framerates)

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