Problem to update Nuvi 1490T

Hello,
I wanted to update the maps of my nuvi 1490T

since I had little space on nav I decided to update only a partial map, the problem now is that, in other countries have only the main roads

all day I'm trying to reinstall to update the maps of all Europe but without results

I have subscribe to updates for life, I follow all the steps, but I can not update all maps

Garmin Express tells me that the device is updated (Europe 2016 maps) , but in reality there are only a few countries on the nav maps

how do I fix?
no way to delete all maps and redo everything from zero?

thank you