DownLoad CWcheat Database Editor. Google It.
Install it.

*Then File, Open Data Base ( Look For Cheat.Data Either On PSP Or Computer)
*Then When It Loads, Right CLick On Cheat.db. ( Post Code )
* Make Sure You Have It Like THis....b4 you post.

Code:
_S UCUS-98646 
_G Killzone Liberation 
_C0 Infinite Health 
_L 0x0003DE88 0x00000000