GarminDevice xml doc 2kb --> remove
gmapsupp ---> rename, it lacks of the needed extension .img
gmapsupp.unl ---> remove
GPDATE.GCD : badly renamed this too, this is the firmware update file for the original plotter---remove it
Could it be the plotter ?
NO, absolutely.
Map now is unlocked correctly and has FID 3250 as I guessed earlier, your sd, like it is, cant work in any plotter released or with a firmware updated after 2011.
But you must remove useless files and, most of all, the gmapsupp.unl file, because the map is unlocked and it makes your map not working as Neil repeated you above.
I'll move this thread to the correct section.

PS: Hint:don't buy maps from eBay sellers. Waste of money