The updater can be quite picky. Sometimes involving uninstalling the software and deleting the registry key as well. I'm gonna need to do some hunting for that key and I'll post back when I find it.
While we're waiting for that, what mode is your player in when you try to use the SMC. Also what version of SMC do you have? Latest is 4.236 (if i remember correctly)

Hmm... what O.S are you running (SP included)
It may need to be uninstalled fully (including the Registry key)... I know i've got them somewhere, still looking

Alrighty, I found the Regkey (after an almost Quest for Fire type journey) but the Reg key you'll want to search for is: FC053571-8507-44E4-8B6D-AACEAB8CA57C
Delete the entire folder that its located in and restart your computer.

*Note before deleting anything in the registry, make sure to back it up first in case of accidental deletion.
To do this, go to file, and select Export.
Name is something obvious like "SanDisk" or "I hope this works" lol something you can readily identify and then click export (note where it saves as well. Desktop recommended)
If in the event something goes wrong, you can merge the old registry simply by double clicking on the exported registry file.
Still looking for the Firmware Updater