Yes, all that is fine. So whilst I can copy the files over, the unit refuses to go past the start up logo (when not connected to PC). No loading maps nothing. When it is connected to PC it stays on the logo but I can see the internal drive and all the files. I'm missing the gmapproc.img file, so I think that might be the underlying cause. But what do I know, I'm a network guy! I tried removing the XML entry referring to the gmapproc file, also I tried substituting the gmapsupp.img that was located in the Map folder for the gmapproc.img file in the .system folder. But nothing, hangs on the logo. The unit had already been difficult to boot into before I tried the format route (in a reboot loop at loading maps stage). I was hoping it may have been a damaged file, so that was why I copied all the files (bar the bl**dy .system folder) and formatted.

From what I can see in the GarminDevice.XML file I am missing the gmapproc.img file only now.

Running out of patience, and time. It needs to be up and running by the weekend really. I'm about to call it, and throw it.