Metal Gear Solid: Peace Walker

[Fidu21]

I need help, so i've been following all the tutorials on how to make cheats work for PPSSPP, i'm using the latest build (2014/3/8) and everything should be fine, but for some reason when i go to the cheats menu, nothing ever pops up. and i can't find a solution.

this is the cheat i'm using:

_C1 One Hit Kill [Mechs]
_L 0x2001B764 0xAE200064

help would be very appreciated!