@railroad,

Firstly, thanks for your replies.

I tried both methods on the original SD card.

Without the original files, just your file, "No GPS" message appears.

With original files and your file, it will play the original GPS program.

There are only two folders in the original card. The folders are named "Buloo" and "ecupdate". The Buloo folder is where the nav files are kept (2gb size). There is nothing in the ecupdate folder.