hi i have a 3790
the navteq maps are working but the TTN keeps on coming up expired after like 2 min!!
i tried using both unlockers, the fid 1572 says lifetime but the map say expired
here some info if this might help
nuvi 3790
Sofware version 2.5
gps firmware 2.20
pmic version 819
tcs version 1.16