I have CFW version 5.50 GEN-D, its not the latest. So, I've decided i won't be using the Playstation Store, and i should downgrade back to 5.00 M33 (for compatibility, etc.) Now I've been out of the hacking scene for a while and i know there is a way to downgrade from CFW to another CFW without a pandora batttery and MMS, but i have forgotten what it is.

Any help is appreciated.