Hi Guys,
Your capabilities are very famous and now I got a friend with a Zumo 660 that he deleted all the files.
It goes until Loading Maps and turn off.
I got to put it in Mass Storage Mode following the same instructions that you gave above.
I copied all the files from another Zumo to this and deleted all the maps to try a cure, but it doesn't go ahead. It keeps turning off during Loading Maps.

Any tip to solve the problem?

Thank you!!