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Did you get patchwall 2.0 update in Old/New TV? I have MiTV 4 Pro. My android security version is July 2018. Even the Pro series don't have basic features like remember the last input source. I know they released this feature to few devices, but it was so buggy that people feel they were better off without the update. Mi seems like a fraud company to me.
For old MiTV, see how the response of moderators changed with time.
October 2018: All old MiTV will get Oreo 8.1 update with Playstore.
November 2018: Update will arrive early next year.
January 2018: Update will arrive this year.
April 2018: There's no official information regarding the update release date.
EDIT: If you got the Patchwall 2.0 update, or Oreo update for old MiTV. Please share the screenshot in comment which clearly shows android security level and build number. We need proof to trust you because most of us have not recieved any update.