ok.. so I was able to get DNG files from the CRW files using SDMdng ver 1.01 but the photos all come out with a magenta color..
Not sure that its your problem but if this was CHDK code then that happens when the cam_CFAPattern in platform_camera.h is wrong. As I understand it, there are only two choices :
#define cam_CFAPattern 0x01000201 // 0x01000201 = Green Blue Red Green
#define cam_CFAPattern 0x02010100 // 0x02010100 = Red Green Green Blue
Code needs to be recompiled to use the other pattern.