I have a B650 and it will show movies from a flashdrive.
It won't show all types of video files, some codex are still not supported, but it will handle a lot of them. The user manuals have a list of what file types the TV will play.
I searched for firmware updates for this model that enables me to watch movies using flashdrives. Unfortunately, samsung don't have it. Should I request for one or can I use other firmware for other models?