Welcome to Justanswer.com, my name is ***** ***** I will do my best to assist you.
Thankfully, both of your devices have the LM designation in the model title. Meaning, y ou dont have to pay for map updates. You get them for free.
So all you need to do to upgrade the maps, is download and install garmin express on your computer.
Then, connect ONE of the garmin devices to the computer.. Turn it on, and then launch the garmin express program.
Once it recognizes your Garmin, it will show you the available updates ( including maps ) Tell it to install all updates, and it will install them. Be warned, even with decent internet the map update process takes about half an h our to two hours, Per garmin unit.
If you get stuck or run into any issues, let me know.
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Senior Technician and Network Switching Systems Operator / Maintainer.