Log in to the "My account" part of the humminbird website. Once you are there, you will see a section saying what downloads are available for your unit. Download the version 4.78 to your desktop and then copy that to your memory card. After that, put the card back into your fishfinder and turn it on.
IF you have two or more different updates on your card, you will need to delete all but the latest version.
I put my memory card in the right slot because it's easier for me to remove it when I need to update.


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