PSP "Pandora's Battery Frim. Installer Wont start"

I want to make my psp slim 3.6 to a psp slim 3.6m33 and to do that i have to have "magic memory card" and pandora battery and when i try
i cant start Pandora's Battery Frim. Installer
When i press on the icon and the psp start thing comes (the yellow thing with a white background) and then after 10-15 sec it shuts down
I did everything according to guides (i read a lot of guides)

I have firmware 2.8 on my psp "fat"
and firmware 3.6 on my "slim"

PLEASE ANWSER ME QUICK PLEASE!

Do you have custom firmware?

no i dont, its from sony i havent changed any firmawares

Which psp are you trying to run the installer on? You need to run it on the psp with custom firmware.

i think he was trying it on his slim but yea u need a custom firmware psp first then you can use the pandoras battery on yours