This tells you how to make the memory stick needed:
http://forums.afterdawn.com/thread_view.cfm/552549
Now for the battery:
"1)Take your battery and open it using a knife or exacto knife
2)look on the main board for the display "ICO4" or "CO4" (depending on your battery)
3)Now, take a needle or something like that and remove pin #5
here is a diagram: (NOTE: you can find pin #5 easily when the ICO4 or CO4 display is facing you!!!!)
__ (pin 4) __ (pin 8)
__ (pin 3) __ (pin 7)
__ (pin 2) __ (pin 6)
__ (pin 1) __ (pin 5)
4)After that, put your battery back together.
Testing your battery:
---------------------
Your will know if you successfully made your battery when:
1)you inert the battery and the green power LED comes on
if it doesnt come on, you did not make it correctly!"
^^ Taken from http://www.pspmod.com/forums/psp-har...ew-method.html
After that is done, put in your memory stick first, then put in your battery. It should automatically turn on, and nothing should come up on the screen, but the memory stick will flash. Plug in your PSP and make sure it has a good amout of power. Press X and the memory stick should flash some more. Just wait. It is installing the custom firmware. After it stops, restart your PSP and you'll be on custom firmware!
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