you may find posts about adding Bluetooth audio, but that only applies to the lower trim, but the color touch radio.
Replacing the head unit with another GM unit is an expensive proposition, because it also handles the HVAC controls. I believe it will take at least one trip to the dealer for programming, and it may not even be possible to put a newer head unit in there.
You can add a second headunit with an aftermarket kit and headunit down below where the CD drive is, but it’s a cumbersome solution.
2012 Equinox 2.4L 1LT AWD, black, 80,000 miles