Question about Garmin Edge 1040

When I connect the device to Garmin Express and want to install updates, I get a message that there is not enough memory available. It says that you should delete unnecessary maps in the map management. So I press Map management-then the message appears that I first have to install updates to be able to use the function. A classic vicious circle. NAVIGATE BETTER WITH YOUR MOBILE THAN WITH THIS CHEAT PACK!!!!