Downgrade PSP 6.20 firmware WITHOUT Pandora Battery?

I would like to run custom firmware on my psp. before I can do that, I need to downgrade my psp's current firmware (6.20) without a pandora battery.

Does ANYBODY know how to do this?

Thanks,
Ben
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  1. UPDATE:

    I would like to run custom firmware on my psp. before I can do that, I need to downgrade my psp's current firmware *(6.30)* without a pandora battery.

    Does ANYBODY know how to do this?

    Thanks,
    Ben
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