Cheat Engine

[iphone4life4]

I have a game and i find the ammo value. Lets say i set it to 1000000000 aka
+inf, the game will give me unlimited ammo for some time but after some time the value resets it self back to normal also the value address gets changed in CE. So someone told be that I can replace the code that writes to the ammo value. But when I try and change the code I click replace and then give it a name then i press okay and then it crashes. So can someone help me. Also if there is another way of keeping the same value and not using it pls tell me. Thanks

Also aside note i went into ollydgb and changed the call that writes to the value to NOP, and when i do that the game does not even start any more.

[vergilganesh]

First u must confirm one thing. The address you have noped writes to an address of ur ammo only. Just right click that instruction in memory view and find what addresses this instruction accesses. If lot of addresses accesses this instruction, try right click on the address in table and find what accesses this instruction then do the same.
Else your instruction accesses only ammo,, then use code injection and try this