Game compatibility has little to do with the CFW that you're using. If a game is not working, switching CFWs is unlikely to make it work.
Originally Posted by dragon0816
GTA IV is known to hang on the loading screen on any CFW if you're running the latest update of the Standard Edition or if you're running the Complete Edition from internal.
There is a fix to run it from internal or you have to run it from external.
CECHL 500GB: OFW 2.50 > OFW 2.76 > OFW 3.41 w/ dongle > OFW 3.55 > 3.55 kmeaw > Rebug 4.30.1 > Rebug 4.30.2
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Off to my summer vacation, might be AFK for a while... Happy Summer!