Won't help
The XL can only use one type of memory not like the GO models that utilise both.

1. Delete all from your SD - don't format!
2. Copy all files and folder from the internal emory to the SD
3. Check if the TT boots from SD, which it should.
4. Download and install a current 910 map, not a 890 map and use FastActivate to activate the new map.
5. Start the TT, it will show the old map.
6. Go into the menu, switch to the new map.
7. Enjoy