Ni bekas copas dari forum laen, ntar gw translate...
1. Get iso_change prx (http://dl.qj.net/ISO-Change-v1.2-PSP/pg/12/fid/24621/catid/114)
2. Rename iso_change.prx to something else (i renamed it to swap.prx) and install+enable it (remember to rename in the game.txt too)
3. Rename Black Sqare to UMD_1.iso
4. Rename Clazziquai to UMD_2.iso
3. Go to link disc menu
4. (For first timers) Wait for 3 minutes will the files are being transferred
5. When asked to change UMD, simultaneously press Note + L Trigger + R Trigger
6. Search for UMD_2.iso (with left-right dpad)
7. Press Circle button to select UMD_2.iso
8. Wait a little while (Don't worry to much if it stucks there for a while)
9. Enjoy link disc
To be updated since I haven't tested it yet. Bakal gw Translate ke Indo nantinya 
Update 1: Skarang lebih rapi dan mudah dimengerti
