As in the cod 5 auto 65 hack you do exactly the same.
Run the exe load cod 4 up alt tab out go to cod 4 folder, change pb to pb2, click easy upgrade bring up the game again to see your stats, alt tab back out and change pb2 back to pb. then your done with all the achievements unlocked and all weps. and unlocks. if you need help message me.
didnt work for me...do you go into your character file or not log into it? because it didnt change the stats for me..
owl go through step by step
3.run the exe
6.go onto the profile you want leveling
7.click rank and challanges
8.alt tab out
9.go to your cod 4 folder and change pb to pb2 then click easy upgrade
10. go back to your game
11. then alt tab back out and change pb2 to pb
p.s it still works i have just tried it also play one full match till it ends or the data wont be saved.. i would play on a NON PB sever till the data is saved then your fine.