Reset the device to factory settings Menu > Ctrl. panel > Settings > General > Factory Settings > Enter lock code. Default Lock code is 12345. Try to upgrade again.
There are two ways to upgrade:
- Start Traveler (Psiloc World Traveler) application > select Options > Plug-in manager > World Traveler update > Check for updates.
- Download the correct version from http://www.worldtraveler.biz/download.html and install it over the existing one.