u must be on 355 if going by the howto...or from Rogero+spoof via recovery?
anyway, from kmeaw QA flagged PHAT NOR console, installed&running fine from Recovery menu
only thing is the QA flag is removed, to downgrade we have those pups(425to355pup/rogero's no check 355 pup)
right, ripped and tested my
Ridge racer unbounded disc fom internal
using (older)
multiman 04.07.00 with settings :
Internal/bd-mirror+original disc = play 
without the bd-mirror, checked internal/game disc = BG
great work Rogero