How do you make game downloads for psp version 5.03

u CANT DOWNGRADE IT IF IT IS ON V5.03 FOR YOUR PSP
LOUSY SONY SUKIEST CANT LET PPL DOWNGRADE VERSION
U GUYS HAVE V5.03 CANT WORK AND ISO OR CSO GAMES ONLY CAN WORK UMD GAMES
SO SONY STINKS I SAY U STINKS ONLY WANT MONEY DUN LET PPL DOWNGRADE VERSION