PSP Slim (jpn) OFW 4.01 -> CFW hjälp!

En kompis som har problem med detta. Kopierad konversation, därför det är på engelska.

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I have a japanese psp slim model 2000 with OFW 4.01 and I'm trying to install CFW on it.
I made my SanDisk Memory Stick PRO Duo 1GB into a MMS with DC7 on my slim 3.90 M33-3. Then I tried making the battery I got with the PSP into a Pandora using OS Pandora Battery Tool 0.6 and Hellcat's Pandora Installer for 3.xx+ -R4b-, but they both say that the serial of the battery is 0x00000000 and I can't change it. I tried using a Pandora Battery that I bought but the screen is just black and holding the L trigger doesn't help. I've tried searching the forums but I can't find anything that helps. Can anyone help me?

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