We just had our 2005 Prius updated to version 6.1. The dealer did it,
charged us $50 and then gave us the DVD for version 4.2 Glad we
poked around the 'net when our override featue for the navigation went
away. Now we get to go back to the dealer again to get the correct
DVD. I'm glad there is a work around for putting the older firmware
file back onto the new 6.1 maps disc to get the override back.