How do I downgrade my PSP's firmware?

Can I downgrade a psp successfully to firmware 1.5 WITHOUT having that little text on the motherboard that indicates its a TA-82?? I heard that you cant downgrade those psps that ...show more

OK, first off i want you to know that i KNOW there are no ways to downgrade a 3.51PSP, except for a pandora battery. the things is i've a bunch of ways to create a pandora battery. the way were you open the PSP battery and scratch the lead i dont wan...

I have one of the fat old PSPs' and I wanted to put Custom Firmware on it. Problem is that I upgraded it to Ofw 5.02. How would I downgrade without Pandora's Battery?

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

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

Hey I have my PS3 and I have the firmware 3.55 and I wanna play assassin's creed revelations and I can't find eboot patched one. so If I update the firmware is there a way to downgrade it?? and I came up with this site saying that you can downgrade....

I have been trying to jailbreak my iPhone 4(that is on the 4.2.1 firmware) since I got it in December. I've read countless guides on downgrading the firmware from 4.2.1 to 4.1 but all of them require to have SHSH blobs from firmware 4.1 downloaded on...

I want to downgrade and then jailbreak my PS3. I am willing to purchase an E3 Flasher, but I would rather save my money if there's a cost-free way. There is an application that is recognized by the PS3 as a firmware update that tells you how far your...