@psalm19pix
I remember an old forum thread that offered an easy way
out of this problem: do not convert the .3fr file into .tiff
instead just rename it from .3fr to .tiff
Read the entire thread: raw files (.fff) from a Hasselblad-Flextight Scanner are not recognized by rawtherapee - #9 by Claes
Easy to test, right?
Have fun!
Claes in Lund, Sweden