I downloaded a xmb because i thought it looked cool, but i have no idea how to install this stuff. im using 3.03 oe-b and i dont know what fw i need. shoud i upgrade to 3.03 oe-c? if i should, can someone teach me how? my friend downgraded and upgraded for me so i really dont know much. If i install the xmb is there a way for me to go back to the default one for the psp?