Welcome back to PSPMOD buddy.
You may want to look into my guide to update your psp phat/go to the latest cfw. All instructions are there.
For your information,
The latest permanent cfw is 6.60 ME 1.6
The temporary cfw for unhackables are 6.60 PRO B-10 and 6.60 LME 1.6.
Even PRO cfw can be made permanent if you apply CIPL flasher.
and btw: don't bother searching for goku or asking for his guide. He has left this site and also pulled his guide from here