If you are experiencing issues with a DUPLEX-patched version of the game, follow these steps to restore functionality: Restore the Original EBOOT:
How to Play God of War Ascension on PC - RPCS3 Full Tutorial
The duplex fix link is available through various online sources, including gaming forums and websites. The patch is usually provided in the form of a .pkg file, which can be easily installed on the PS3.
: The most active forum for PS3 homebrew. Users often re-upload legacy fixes in the "PS3 Resources" section.