Updating your lowrance is really easy. Here is the card reader that I have, bought it at walmart or target.
card reader
You’ll also need a sim card, like this one.
sim card
Go out to lowrances site, download the correct update for your product to your computer. Updates are located here:
lowrance download
Once the file is downloaded to your computer, put the sim card into the card reader and attach the card reader to your machine. Copy the file from the computer to the sim card.
Take the card out of the reader, install it in the lowrance unit and turn the unit on. The lowrance unit will update on its own.
Another good reason to have this setup is to save your waypoints from the unit, in case you have to do a hard reset on your unit or if you buy the map create software.
Jami