I got one of these (a PK250, to be exact).
Firmware on it is V3.21. I tried EVERYTHING in the book getting it to read/update firmware from an USB stick according to instructions. According to the official guide I shouldn't even have to go to Menu -> Option -> 7x "FAV" and then try to read the stick, it should just automatically start with the update procedure once I insert the stick.
But the set acts if it cannot even read the stick, although I see LED activity on the stick.
I tried formatting FAT, FAT32, NTFS, multiple sticks, FW versions .26, .26, .28 etc. The current one is .33
When I go the menu after pressing 7x "FAV" on the remote, it comes up with the screen that "the follwing firmware files are on the memory stick", but then this part is empty, as if it can't read what's on the stick.
I am baffled since anyone else with this TV seems to be able to update FW, except me. (I really did everything right, like making the folder LG_DTV on the stick, putting the extracted FW in there etc... I am at my wit's end)