3.11 official FW to 3.40 CFW

[jxx2005]

i'm using my cousin's PSP to try and make a pandora's battery so i can fix my PSP
it has 3.11 official sony firmware

how do i up/down grade to a CFW that is able to do so?

[jxx2005]

i bump, someone please help i only have another day with this PSP

[splodger15]

Well you need a homebrewable PSP to create the battery you then need to create the magic memory stick to use in the PSP

[jxx2005]

Well you need a homebrewable PSP to create the battery you then need to create the magic memory stick to use in the PSP

...
duh
i know that
i want to know how to get custom firmware on my cousins PSP
it has 3.11 official firmware