Many people are interested in running game iso's and homebrew code on their PSP's.

Sony's official firmware will not allow this.

To use homebrew programs and play iso games, an official firmware needs to first be downgraded to V1.5.

Once a PSP is at Version 1.5, the best and easiest way to play and load games iso's, is to install an 'OE' firmware. 'OE' stands for 'open edition' and indicates that it is a 'hacked' firmware.

To play the very latest games, you need to have the very latest version of an 'OE' firmware.

For more in-depth information on this, and step by step guides to downgrading and installing firmwares, go to the tutorial section.

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how do i downgrade to v1.5 from v4.03

You dont need to downgrade to 1.5 anymore.
See a few post below below about a program called UPT or psp deluxe

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I saw that as well but the above member restarted it this morning lol

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or u can just use a pandora battery and a magic memory stick
you can look it up on youtube to show you how to hardware or software a phat psp battery