I go to traduce the text with my english (quite bad XD)
see you can underestand this:
You remember that Option file can be change database, but before you have to desencript the option file.
You have to use a psp plugin to desencript and after open this with hexadecimal editor and find Kaka´ in the byte nationality position search 2D00 and if you edit this you can change kaka´s nationality.
To edit in hexadecimal use the programme HexWorkshop
I hope that you can underestand this.
I can´t help more, as my english don´t give to much xD
saludos!