I want to downgrade me firmware on my psp?

I have version 5.03 on my psp slim that used to play iso's but not anymore after the upgrade of firmware>.... Any one who can help me...

N1CK4ND08 years ago
Pandora's battery is one option, also you could try downgrading... This will help you.
Tombini8 years ago
First off why did you upgrade to official firmware? To remedy this solution you need a pandora's battery, (just type it into google) There are plenty of ways to make, buy or find one