TOMTOM GO920 Crashed??HELP


Hi ,I was installing updates on tthome when my computer crashed ,Now the go920 is saying Problem with map, You cannot use this map on this device, I have never backed up my TOMTom so im stuck what to do, The maps that are on is United Kingdom and Republic of Ireland 106 and its the same for my other map on the sd card which is Europe Truck 626, Is this broke or can it be brought back to life ????
Thanks In Advance.