Originally Posted by PS3HAX_UK
You should buy an E3 flasher or progskeet(google it) to downgrade your 4.31 phat...
Phat usually = NAND, so the OP should definitely look for a NAND flasher, although he should first confirm his model though by googling ps3devwiki SKU's.
b, no, nothing yet.
c, yes read the tutorials section.