i found the prob , i have a nuvi 205 with navleb map for lebanon build in in the device and trying to put the img of Navigator North America NT 2015.10 on SD , the City Navigator North America NT 2015.10 if u select all maps it will be more than 2 gb i try to just select maps less than 2 gb so it works fine it looks that the firmware cant read maps more than 2gb size
now my question is if i make firmware update do i lose my built in map of NAVLEB lebanon map