Please reconfirm:-
a) your device IS a TT One
b) you ARE using the 3rd attachment from my post #8
c) the 9.702 navcore AND the Europe_TRUCK_945_6247 are both on a 4Gb SD card
d) You insert the SD card in BEFORE booting up/switching on the device
e) you've tried resetting the device using a paperclip in the reset hole
f) you do get the Truck picture (splash screen) on first start up