hello, I have the same problem! A answer would be nice
I tried to copy the files on a harddrive and an usbstick, but no firmware was detected and the firmware update icon did not apear.
Backup all of your files from the thumb drive you are working with. Format the thumb drive as a bootable device and store the firmware update files on the drive. Do not have any other files stored on the device. Try booting up the player and then attaching the thumb drive.
switch on the media player. The media player automatically detects the upgrade files.
if it is a new upgrade it will show new upgrade found automatically and proceed to install it. it then restarts itself. (There is no upgrade button in the settings)