I have a Helix 5 sonar that can’t update to the latest Humminbird software update because it doesn’t have an SD card slot. The only way to update it is via the Humminbird proprietary PC Connection cable (AS PC3) that costs $50+ online. I can’t justify paying that for a quick 30 second 1 time software update, but if any local Marinas/Dealers/Humminbird enthusiasts have the cable and would let me use it to update, I would be most graceful. I have a spare 12v battery I could use to power the unit, so I just need the USB cable..Shoot me a pm if you have one you would be willing to let me borrow it.
Here’s a link to the cable – https://www.humminbird.com/Products/AS-PC3/