"Sorry guys , I purchased the KD49 series X83C.I have updated it to the latest firmware but I encountered two problems that may depend on my inexperience.When I connect a USB key or USB hard disk a message appears on the screen and that"' connected a uSB device but then I can not see the uSB inputs of the TV ( HDMI 1.2 etc satellite , digital and altri.My mistake ? I tried to tune the test channel on Hotbird 4K1 4K but I feel only the"' audio and video and ' absent ... suggestions ? Thanks a lot !