Hacking Help with activation of a .prx

[davethebeast82]

Ok so im on a psp e1000, it was originally on firmware 6.60, then converted to 6.60 pro-b10.
I have tried to use a gta lcs cheat device, i have a recovery menu on my device and it says the cheat device is enabled,but when i go in game to use it ,it doesnt open at all.