Have you debayer your images?
The BAYERPAT in the FITS Header should be 'GRBG'.
You should be able to get a color image when you Debayer with this pattern.
I have checked all the FITS Header by running a sequence of RAW8, RAW16, Luma 8, RGB24, RAW16 one by one.
The first, second, and fifth images all had a BAYERPAT of 'GRBG'.
This means the images are in color.