Thank you for your help. The firmware on my TV is 05.00.10. I downloaded the 05.00.02 as you suggested, but I can't install it on the TV. I unzipped the file, copy it at the root of an usb stick and when I open this stick on the TV, 3 icons open (video, music, recording) each are seen as empty and nothing else is proposed.
I tried to make a directory LG_DTV and copy the firmware in it, as suggested by the "update software update guide" found on the same page as the firmware, but this fails too.
What is the right way to replace the firmware?
Thank you.
F.P.