It's been years since I fiddled with my One XL, but I found it in a drawer today and thought it'd be good to get it updated.
I have the Western and Central Europe map on a 2GB SD card at present, along with Guam (which I seem to recall was needed for the W/C Europe map to work

TTGO.BIF:
DeviceName=TomTom ONE XL
DeviceVersionHW=ONE XL
BootLoaderVersion=53026
ApplicationVersionVersionNumber=8010
ApplicationVersion=9369
CurrentMap=Western_Central_Europe
CurrentMapVersion=675.1409
TTNAVIGATOR.BIF:
TTGO.BAK:
Not Found...
TTGO.ORI:
Not Found...
Could someone point me in the right direction please?

Thanks
Josh (UK)