Hi I am in desperate need of help with downgrading my phat psp that I bought 3 weeks after the psp first came out. I thought it would not give me a problem to downgrade my phat psp even though it has 4.0 official firmware on it. I have bought the pandora tool battery off the link for the cheap pandora battery ($10.50 with free shipping) and read through endless amounts of forum information on how to downgrade a psp with a pandora tool battery. I have tried countless times and it has not worked. After I make the MMS which i have a 256 mb and 1 GB (tried to make on both) and then put in the pandora tool battery nothing happens. My psp does not come on like I read when following the directions for downgrading my psp. So I am asking anyone that might be able to help me on how to downgrade my original phat psp with a 4.00 official firmware on it. Thank you in advance just for commenting and trying to help me.