How do I downgrade psp phat firmware from 5.01 to 1.50 without pandora battery?

I've recently been doing a lot of research on how to downgrade my Psp Slim Model 2003 TA-88. My firmware Version is 6.20, I want to go down to the Official 5.00 & then install M33-4. However, each website I find unreliable due to remarks 'Un hackable...

or any other way to play iso s on 3.50??? Or plz give address of some shop in chennai,India who downgrade 3.50 firmware for under 700rs ... even ritchie street is fine Thanks

i have a psp with version 6.20 fat plz help or give me links leave comments or tell psp hack pros to try to hack v.6.20

Can I hack my PSP GoW edition (version 3.95), using a phat pandora battery and phat pandora memorystick? My friend has hacked his phat PSP and I borrowed his stuff, but the ...show more

so I found this psp phat the other day, and I was trying to make a update it, but somehow, it got bricked I got my psp slim (model 2004) though, so I decided to unbrick it myself however I can't find anywhere how to do this, i've been looking it for...

I have Firm Ware 6.20 on my PSP and wanted to get CFW 5.00.but I dont have the money for a pandora battery and i already formatted my PSP. is there a way to downgrade my PSP without pandora's battery? I have PSP 2000(PSP slim) Im not sure what motherboard...

I Bricked my psp,and I'm thinking about buying a pandora battery,but I don't have custom firmware on my psp. It's firmware is 4.00.So is it still possible to unbrick it using a pandora battery.(I also have a magic gate pro duo memory stick)

Let's say I turned a Phat's battery into a Pandora battery. Can I put it into a Slim PSP and downgrade or unbrick it? Don't the two versions of the PSP have different batteries..?