Could you tell us what the difference is? Your initial answer sounded like it was minor at best and subsequent answers have not really clarified things
My Hopper 3 updated to 392 . I never had 391 so I cannot speak to any updates or bug fixes.
I tried to post this earlier but it does not seem to be here.
I don't know. Maybe some people just want to know which is which instead of having to check them out first. If the SD channels go away that would be a good time to eliminate the designation.