Hi
Just to confirm, the lettering [A, B, C, D] after the part number on a 7E0937090 BCM refers to the software/firmware version.
Looking at the actual units out there, some seem to have the version letter directly etched on the unit itself e.g. 7E0937090C, whereas others have nothing, just 7E0937090
If you do have a basic 7E0937090, is there any reason to update them, and out of interest, how do you update them exactly?