I have a custom mapset that I have been using for quite some time now, I have made several copies and used on various nuvi models. This mapset was working for over 2 months then all of a sudden it starts saying "Cannot Authenticate maps"

Nuvi model is 1490

I have been copying the files SD card to SD Card.
Then using gmap tool to get the required information to enter particulars into garmin keygen, to create a custom UNL file.

Like I said this was working on this GPS for quite a while and only started doing this recently.


I've also tried re-flashing the GPS software .. running latest 5.30.


Anybody with any ideas?