I found that if the samsung exif camera and model data are modified the raw file becomes readable by Photolab.
Changing the exif parameters create “spoofed” versions of dng files,replacing camera make and model. The created dng files can be developed using Photolab 4.
Both methods override the camera make and model to “Apple” and “Apple iPhone 8 Plus” .
Method 1 : Use a command line tool. exiftool -m -Make=“Apple” -Model=“iPhone 8 Plus” -o %d%f_spoof.%e FILE …
Method 2 : Use Exif Pilot to edit the metadata fields in the graphical user interface.
Tested on dng images from Samsung phone models S8 and S20 5G.