As a proud owner of the $35 Chromecast device, you already know the software in the dongle is always updated automatically. Google never asks you to update, or reboot to update.
So, you can enjoy the Chromecast without wasting any time on updating the firmware/OS.
On September 13, 2016, Google released Chromecast Preview Program for opt-in Chromecast owners to enjoy the new features and new version of software before such updates are broadly available.
In other words, Chromecast Preview Program, if opt-in, puts your Chromecast device in a special channel that receives software udpate before Google makes the update available for all other devices.
The update you get through Chromecast Preview Program is NOT beta software. It will be the final update (preview). In most cases, you just get it a few days (or one or two weeks) earlier than others,
For modern software … Continue to read the post....