Try to backup the sd and format it with the formater.
Edit:
If someone wants to know:
You can edit the language.dat with a hex editor and change everything.
Have fun
Edit2:
What is also interesting:
If you bring up the RTS Menu, there is a Guide option.
If you press it, it shows a pic and the line "Guide not found! Press "B" return to game." (It is really like this.)
I will try to find the file that it shows.
Edit3:
Uh nice...
Got this from the website: (
http://www.r4i-sdhc.com/aboute.asp)
Edit4:
It is really that easy. Create a txt in the same folder where the game is, with the same name of the game.
It shows the Text with the "BottomScreen.bmp" as background at the top.
The bottom screen is white.
If you just add a .bmp in the same folder where the game is with the name of the game, it just shows the .bmp without text.