I have a fat ps3 with 4.21ofw on it. I wan't custom firmware. I know I need to downgrade in order to get cfw though. I was thinking of using e3 flasher. But If I do that will I need the esata docking station? Or can I just buy the flasher. And the ps3 is CECHP01 I have found no info on installing it to a cechp01 so please help!