Thread: Transform a Nuvi 37xx in a Nuvi 34xx for dummies

dear all,
this is my first post.
great jobs, not only this thread.

I followed all the steps, new method, and i was able to convert a 3760t into 3490. It worked fine for a week, and after that started a strange behavior: it starts up and instead of showing the map show only a gray screen. just instead of maps. I see all the other icons etc. It even works correctly, telling me where to go (upper of the screen and voice navigation).

my current setup is: all the EU 2013.30 maps on a 8gb microsd, as well as 3d trafic and buildings and all the other big files.

sometimes, removing and re-inserting the sd card it start working, other no.

can anyone help me? is this a matter of the sd itself? but why the navigation works fine, even if not showing it on the screen? is there any logfile i can look at to see for the problem?
thank you