The Google release page only goes up to 1.50.xxx for any device? https://support.google.com/chromecast/answer/7124014?hl=en
When I open Google Home and go to the Chromecast Dongle it's showing the firmware as version 1.56.280498.
The dongle case has Model number NC2-6A5 on it, (Gen 2) however the box has SKU GA00439 on it (Gen 3).
When was Chromecast firmware version 1.56.280498 released?