Hi
dida2015 , It is not missing software update, this Plasma TV has USB 2.0 input and it is only possible to view photographs in JPEG format and play music in format MP3 Allows you to watch only MPEG 2/4 videos, Subtitile for DivX (HD / SD) Movies you can watch with an external player (DVD) through the AV input or HDMI input.
There are DVD players that have USB to play movies in all formats.
I leave you a link so you can see the TV specifications.
http://www.lg.com/co/televisores/lg-42PJ350-pdp