How do I downgrade my PSP (not 3000) from firmware 5.01 to some firmware lower?

psp? how do you downgrade the psp from the original firmware to custom firmware ex: 5.00 firmware please help!!!!1

my system info is 6.20 firmware, but i want 5.03 ISO GEN on my psp so i can download free games. i own a psp 3000. the psp is silver and it came with grand turismo in a bundle. so can a pandora's battery give it custom firmware. if so please tell me...

I have a psp with a 3.90 M33-3 custom firmware. Could someone please help me to downgrade my friends psp using mine cause I heard you can create a pandora's battery with a psp that has a custom firmware. Please and thank you.

I currently have 3.40 wildc*rd firmware and i want to downgrade to 1.50. The reason is that i want the official firmware now

I recently bought a psp 1001k off of Amazon.com and bought a couple games (Dissidia 012 and Final Fantasy IV The Complete Collection) while I was at it as well. However, whenever I go to play these the "Game Could Not Be Played" (or something...

i want to enable firmware 3.52 M33-4 on my psp, but it says i need to downgrade it to 1.5. if its possible, i need to know how to downgrade it, but if it's not possible, how do i enable 3.52 M33-4?

I would like to find a way to do this without a Pandora battery. If there is no way to do this directly from my current firmware, which firmware can i upgrade to and how? In the hopes of eventually downgrading all the way back to 1.5? Please don't just...