I didn't even put file patch code in my .gct anway, because ik Riivolution doesn't like it. It's just that it has never worked. I have tried everything, Gecko Os, multiple versions of riivolution with different .xml's, Renaming, modifying xml's. It just doesn't work, my friend got it to work with modlauncher.xml...... but that didn't even work for me. (NTSC-U btw). The Custom CSS works though, textures always worked....just not the ocarina codes for them :/
I have the same issue. I use RSBE01.cgt and it doesn't work at all... Maybe because I have too many PSA?
Edit: I found it: just don't use SD card more than 2gb.