i used my battery and stick on other PSPs, fat and slim, but it doesn't work on PSP-2001PBs.
i don't know why, but on the first one, it gives you error 80020321 when you start the program.
the other instance is that the psp turns on when i plug in the battery, but the screen is not showing up.
btw, i'm using cementerio v4. i don't know why it doesn't work on black psps...
help is really appreciated.