I have found videos on youtube where people put custom firmware on it without a pandora's battery. I just want to downgrade my own or buy another PSP that doesn't have the latest official update to it.
I have the update 6.20 from the playstation website.
Sony PSP 2000 Piano Black Handheld System
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You’re leaving out the most important information that someone needs to know to help you.
What is your current firmware?
Once you post that I’ll edit my response appropriately
Cheers!
EDIT: Sorry to say this, but you can’t downgrade a FW 6.20 as of yet. You can wait around for a downgrader, but as of today, there isn’t a 6.20 downgrader.
EDIT(2): If you are looking to buy another PSP (one that is able to run homebrew games and such) then make sure it is a PSP that has firmware 1.50 to 5.03. If you don’t want to bother with Pandora, then look for a PSP with firmware 1.50-3.XX (I believe).