Can someone please tell me how the param_sfo enables games to be played on low firmwares than originally intended. For example LA Noire being played on 3_55CFW when it was designed for 3_60 (i think).
I understand that when opening the sfo file in a hexeditor, their is a byte or two that details the firmware version (among many other settings), and this can be edited to be played on 3_55 instead of 3_60 FW.
But if this is so, why hasn't Portal 2 or saints row the third been altered for this kind of use. Is there another file somewhere that can not be modded or is it slightly more in depth.