Thank you Mac, I've actually already hacked my scanner with your first-ish firmware two years ago. Fact is that at the time we were not talking about A, B or C, so now I find myself in possession of one of Kodak's original firmware (so I can revert to a safe standard) plus one of your high bitrate firmware (that is now in use in my scanner).
I'm not worried about going back to now: I just wondered if there is another method to determine, by serial number or working original or modified firmware content, the revision of my scanner.
I think I remember that my scanner had a different version from the one you first changed, so I had only performed the fix of the firmware, once the 'new' version was available at Kodak's. It was 2023, so I believe it should be a version B...
My serial number is M2023148BK00607, let me know if you have any idea on the model.
In any cases I think the ultimate way to check it, is to try and flash the 6.8 B and see if the screen turns on properly

Thank you! F.