CFW on phat psp running 5.55

Hey I just got a phat psp running 5.55 firmware. What is the best guide to follow to put a cfw on it.

Thanks in advance

After doing a little research its saying that I have to have the pandora battery to downgrade the firmare but those were posts from over a year ago. Is there anyway to do it without using a pandora battery?

[monkeymaximus]

Try using PSP Grader V008 (you can find it in the downloads)

It makes a MMS that has Despertar del Cementario V8(DC8) which will take you to 5.00 M33-4.

Nah, go use Rains Ultralite MMS maker.

much easier.

or make a simple mms of any fw you like and with a pandora, go back...