Longtime Lowrance user that recently made the switch to Helix units. Not wanting to lose any of waypoints, I saved them all to an SD card and formatted them through Humminbird PC. I have followed every instruction I can find, but when I load the card, nothing happens. I've taken out the Lakemaster chip, put the new chip in with the unit on and off, and every time it's the same thing, nothing. What am I doing wrong? Do I need to erase everything but the .gpx files? Any insight is appreciated.