shock troopers 2

Hi there, I got a Shock Troopers 2 with P1 mask rom dead, its blown in the middle of eprom. I don't had one 27c160 to change it so I tried with an 27c322. The process was this: P1 have 1MB 27c322 is a 4MB eprom so I got the rom and copied p1, doubled it to 2MB and doubled to 4MB, when I teste...