Iso's are illegal first of all. any psp after 1.5 is almost noncompliant to homebrew. That code really means that you cannot play the games without the disk in the system. My advice is to downgrade to 1.5 or buy a 1.0 if u can find one. Sony made the 1.0 for homebrew. after threats of lawsuits from other game companies sony put in firmware updates. have a 1.0 is a good idea, upgrade it to 1.5 and you are stupid, upgrade it past that and your chances for homebrew dwindle.