I raised a ticket via the knowledge base and received a prompt reply.
To fix you need to do the following:
1. Go to www.memory-map.co.uk/update
2. Open "FREE Download & Self-Update" and click on file and download
3. Using winzip (or equivalent) extract the files to a micro SD card as per the instructions. However after extracting them move the contents of the "ADV3500UPDATE" folder to the "root" directory of the microsd card.
4. Open up "Update by post" and click on "download them here" to get the step by step instructions
You should now have reset the device, mine worked. If you do not have a spare sd card available contact memory-map. If your unit is new I would expect this to be free of charge as their unit/software being faulty should not cost you anything. Myself I had a couple of spare microsd cards available from old blackberry's. microsd will need to be able to accomodate 109mb of files.
Hope this helps