Most major advantages are unlocked through the menu using "Exchange Points" earned from completing chapters with high ranks or playing the Mercenaries mode.
: Clear the game on specific difficulties to unlock visual modes for 0 Exchange Points: Classic Horror (Black & White) : Clear on Amateur. Retro (Sepia) : Clear on Normal. Noise (Grainy) : Clear on Veteran. Infinite Ammo & Special Weapons Cheat Codes For Resident Evil 5 For Ps3
: Complete all chapters on Veteran difficulty. Most major advantages are unlocked through the menu
Resident Evil 5 for the PlayStation 3 does not utilize traditional text-entry "cheat codes" popular in older generations. Instead, it relies on a robust system of and In-game Exploits that players can earn by completing specific milestones, such as finishing the story in under a certain time or fully upgrading weapon classes. Core Gameplay Unlockables Noise (Grainy) : Clear on Veteran
Can i get infinite ammo without beating the game? - GameFAQs
To use infinite ammo, you must first complete the main story. Once the story is finished, you must fully upgrade all attributes of a specific weapon to make its infinite ammo version available for purchase with Exchange Points in the menu.