ok if you didnt have it your psp plugged into the charger while you were updating it, your batterymay have died and your psp is missing key files to run at all due to the process of updating ur psp and the power it requires.
Bricked is the word but its not over http://forums.afterdawn.com/thread_view.cfm/688507
this site will help about five comments down. you need to install netframework 2.0 so your computer can read ur psp directorys. this is a unbricker for any psp and a stick of a least 512 mb is required and at least a pandoras battery. when you use the psp pandora deluxe program it should install pandora support and a program call pandora installer and go to battery options and make pandora and if it doesnt work google pandora battery and a slim may require a method of cutting a chip in the right spot peace plz respond