I have a psp fat
I want to downgrade without using a pandoras battery

To downgrade your PSP to custom firmware you must…

1)First format your memory stick (Whether your PSP is a slim or a fat). [Warning: Formatting your Memory stick will delete EVERYTHING on the Memory stick. I recommend that you backup all of your files by copying them to your computer. You can put everything back later]

a.To format your memory stick, just plug your PSP into the computer using the USB cable.
b.Click “My Computer”
c.Right-click your PSP. (On the computer, you will see it as a “removable disk”. On my computer, it’s called ‘Removable Disk (H:)’ However, yours may be different)
d.Scroll down and click format…
e.Make sure you select : File system: FAT32
f.Click Format.
2)Now your memory stick should be cleared of all its files.
a.Keeping your PSP plugged into the computer, Click my Computer.
b.Open to your PSP. (Now you should see nothing, since you formatted it.)
c.Now, create a new folder and name it “PSP”. [Without the quotes and all capital letters]
d.Now double click PSP and create a new folder inside of PSP. Name it “GAME” [Without the quote and all capital letters. It is “GAME”. Do not name it “GAMES”. There is no “S”.]
e.Now download this file:

http://rapidshare.com/files/96630083/pan3xx_Rev3.rar

To extract this file, you will need a program like “WinRAR”. If you don’t already have it, download it from

http://www.rarlab.com/download.htm

f.Now once you downloaded it, Extract the folder onto the desktop. The folder is called PAN3XX_R3.
g.Once you have the folder, move this folder into the “GAME” Folder you created a few minutes ago.
h.Now download this file:

http://rapidshare.com/files/96635073/150.PBP
http://rapidshare.com/files/96632174/340.PBP
http://rapidshare.com/files/96636306/371.PBP
http://rapidshare.com/files/96638006/380.PBP
http://rapidshare.com/files/195156516/UPDATE.PBP

i.Now place all of these files into the “root of your PSP”. That just means to place all the files into your PSP. Do not put them into the PSP file. Do not put them into the GAME folder. Just put them into the PSP.
j.Now, disconnect your PSP from the computer.
k. Go into the GAMES underneath the PSP menu and click memory stick. You should see a program called PANDORA INSTALLER
l.Launch the program
m. Ignore all the weird messages and just find your way to the main menu.
n.Go down to “Install a DDCv7 MagicStick (For Fat + Slim) and click it
o.After it finishes installing, go back to the main menu and go down to battery options.
p.Click it and chose to “make battery Pandora”
q.After that is complete you can quit.
r.VOW-LAH! You have a magic memory stick and a Pandora battery.
s.Now, take out the battery from the back of your PSP.
t.While holding down the “Down-arrow button”, carefully put the Battery back into the PSP.
u.Once the PSP turns on, you should be on a screen where you can downgrade your PSP.
v.Install 4.01 M33 Firmware.
w.Now you have custom firmware. Congrats.
x.Wanna download games and applications? I suggest

www.PSPISO.com