welcome to this site lad! please go here and grab hellcat's recovery flasher FaustNero
extract the file and copy file into psp file dir ms0:/PSP/GAME. run it on your psp and select target which is 5.00. when flashing is done, grab 6.60 OFW (you can get it from the download section of the site) and use the same process how you put the hellcat's into the psp. run it.