Ok, there are two downgraders.
- A 3.03 downgrader that requires an unpatched GTA: Liberty City Stories UMD
- A 3.11/3.50 Downgrader that requires Lumines 1.
After that, upgrade to Custom Firmware (A modernized firmware with homebrew capabilities). I believe the newest out there as of now is 3.90 M33-2.
I dont really know how to do anything past that because I dont own a PSP myself
EDIT: Custom Firmware is NEEDED to play PS1 games as it makes use of the Sony's Commercial emulator used in Firmware 3.00 and above.
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