Open source for OS

Is there any way to put a better OS ?
Is the current OS open source?
Thanks

There are 3 HDMI ports and you can put anything there.

#1: Nvidia Shield
#2: Chromecast with Google TV
#3: Roku

You can put Nvidia, Google, or Roku but it’s still a work around to a unusable OS that we pay for in the unit it self.