OK iv had somewhat of a success. I now only have the one Garmin folder and updated the gmapprom.img & gmap3d.img with the latest versions.
Garmin opens unlocked and i can see the map, great. But now it just searches for gps signal and cant find one. From memory this had something to do with the portsplitter, which is in the RunGMXT folder. Possible setting is Com_2 & Baud 57600, again from memory.
Do you remember how to set this? Was it done in the SD card on the pc, or on the device (mio moov 370 with miopocket)?
Tried opening portsplitter on pc but its not a version recognised by windows 8.