My TT one xl claimed internal memory only but on the bottom, in line with the connectors was a taped over sd slot.
The slot worked but only with the older SD cards.
Changed bootloader
updated navcore
updated maps to 965
now have 4 Gig SDHC card working with full area map and if I pull the SD card i go back to the original stuff.
maiden voyage around town. GPS told me to go right, then left on parallel road then left and right back on the same major road I was on within a mile.
GRRRRRR