I have a Samsung hd tv UN40K5100. Out of now where a pop up/ ad, kind of like as screen saver showed up. It never goes a away just moves from left to the right of the screen. it says "NEW Samsung hd full wide color enhancer, full hd 1080P, connectshare movie, UN4OK100."
for some reason I thought it was an ad from my firestick but I completely restarted that to default settings and it still there. How do I get rid of it???
Sounds like your TV is in demo mode.
Not sure if these are the correct instructions for your set
but you can search for other options online or explore all the menus on the TV.