The PSP has never had the software support that it needed to be a really commercially successful system. Since Sony blew it already, you may as well go the extra mile to make this expensive little thing you bought more useful right? This video will teach you how to hack a PSP 3000 or 2000 with firmware version 5.03. This is a complete hack, meaning that you will be able to play .iso games and everything when you are done. Get to it! This should let you unbrick your psp 3000.
From the creator:
This is a tutorial on how to hack your psp 3000 or 2000 (the one that can't be hacked with the pandora battery)
*You'll need 5.03 firmware to do this* nothing else will work.
ChickHEN - http://dl.qj.net/5.03-ChickHEN-Enabler-Revision-2-PSP/pg/12/fid/26993/catid/114
CFW Enabler 3.60 - http://dl.qj.net/Custom-Firmware-Enabler-v3.60-PSP-Homebrew-Applications/pg/12/fid/27382/catid/151
5.03 Update - http://www.psp-hacks.com/file/1645
(just open the zip folder then put the EBOOT.PBP under /psp/game/update)
If there is no update folder just create one. Then run the update on your psp.
To put games onto your memory stick, you will need to download an ISO or CSO file from a site like PSPISO.com.
Make a folder called ISO in the root of your memory stick. Place the ISO/CSO game into the ISO folder. Run the games through the XMB in the game folder.