This has not worked for me. Tried two different usb sticks. unzipped file. Put on root of usb. Sometimes the invitation to copy media files appeared so usb sticks connecting.
But no sign of the updating. (need to have tv on and on the correct channel!)
Can this process be done via the internet connection? Will it become available over the air?
Either the format of your usb stick is wrong or you have not unzipped and put the file at root properly. Or you didn’t put the stick in before turning on at the mains, or you have multiple usb sticks plugged in..