ps3 modding help without jailbreak

I just wanted to go through some of my old games I've beaten 100 times(example: fallout new vegas) but everywhere I look it seems that I'm required to jailbreak which I refuse to do for obvious reasons. So is there any way I can mod games without jailbreak? I'm not into cod or any of those, I'm not looking to cheat people more than just having fun on an already beaten campaign game. If you can help thank you!


P.S. not too tech savvy so if you come in just blurting file names I won't understand, thanks!
 
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