How to change textures??

In the old warrock, i changed a lot of textures, but now, wen the game loads a map with the edited textures (i only changed the md500 and hunvee textures)
i get crashed T.T

Help me please (i have adobe photoshop and a .dds converter, it works with old warrock but now no worsk T.T)

I don't know how to change textures in this game but i do in gunz online, maybe the process is similar, after you edit the textures i guess you have to compile them all right? and you have to change de crc32 O.o

When i change the textures, i rename it correclty, but now i dont use the same program to conver the .dds
maybe this is the problem, im gonna try with the other .dds converter