http://redump.org/disc/62641/
Unlike all the other discs of this game, this disc's ringcode starts with "DS0" (the number 0) instead of "DSO" (the letter O). The DB has it starting with "DSO". The correct ringcode is "DS0 M2 01%".
Please observe the attached scans of discs 1 and 2. On disc 1 (whose DB ringcode is correct), the font used has a slash for the 0 and no slash for the O. As such, on disc 2 you can see that there is a 0 instead of an O.