There is a trick for it. Press and hold the a button, then press the b button. If your speed are too slow or too fast, then you may need to do it several times.
After it you may encounter another problem, like the memory card loop screen. Try using older SVN below 3100 if that happened.
After it you may encounter another problem, like the memory card loop screen. Try using older SVN below 3100 if that happened.
