i tried all ports and all works. now it's connected to 3.0.
i have only one annoying thing with this connection type. i am using lg smartshare as a dlna server and "photos and videos" app on tv for watching things. sometimes that "photos and videos" app couldn't find my pc. than i have to click multiple times to refresh button from top right, close the app and reopen the app. other things works perfectly like plex, iptv, youtube etc.