An error occurred while querying your Garmin GPS for information. Please ensure its software is current, and retry the Setup.
There were no good google hits for this error message. And the Garmin support website was no help either.
I eventually resigned myself to calling tech support. The first-level guy didn't have any new ideas, so he passed me on to a second-level support tech. That guy used a special utility to make sure the unlock codes were cleared, but the install still failed. He said that the unit was hosed and had to be sent in for factory repair. I was irritated and frustrated at the whole situation.
Today I called Garmin again to demand a refund for the map update. In the course of handling that, I got through to a support manager. In our conversation he mentioned that norton antivirus is known to interfere with the map update process. Sure enough, I went into symantec antivirus, chose "unload service", and then the map update succeeded.
Why didn't the 1st and 2nd level support techs know to suggest disabling the antivirus? *sigh*