If the above solution does not work for you, there are alternative solutions you can try:
: Duplex was a prominent scene group that released a "fix" for this game back in 2013 to allow it to run on older Custom Firmware (CFW) versions (specifically 3.41/3.55/4.21). godofwarascensionebootpatchps3duplex fix link
In the early days of PS3 jailbreaking (specifically the 3.55 CFW era), new games like God of War: Ascension If the above solution does not work for