Hi
From my original write up, which was a while ago now and my memory has faded.
But you seem to have the files properly expanded onto a SD Cards
So
Expand it onto the root directory of a SD Card, 4Gb to 16Gb, inserted into SD Slot 1.
Be sure the content is in the root directory.
Press and hold Menu button for 10 seconds to start Service Mode, (takes a while)
Then go -. Software update -> Versions -> Select Release and chose the file
Then let it run.
Ihope that helps Derek