Need Help Asap!!

Ok, first I used to have a phat psp. Sold it a couple days ago on ebay and am getting a slim psp. I want to put CUstom Firmware on it. I have a pandora battery and its been made but do u have to do it a certain way for it to work for the slim? Because then do i need a phat psp? Or am i screwed? Ive used it on my phat psp and it works. Do i just need to put certain files on my memory stick to install CFW on the slim? Or do i need to start over with the battery?

You just need to put the files on the memory stick.
(But you can only install CFW, theres no 1.50 support on slim)

Ok Thanks, Also one more question. If i were to brick my slim, could i unbrick it because i hear you cant unbrick it.