You probably checked this, but another common issue is not downloading the correct version of the update. The version has to match your unit exactly. I.e. HELIX 7 CHIRP MEGA SI GPS G3N if yours is as described in your post title. Otherwise your troubleshooting with the SD card is what I would’ve done. Could try a different SD card??
I appreciate the response, thank you. Yeah, I have to admit that for a while I was using the wrong update file, but I believe I got that sorted. I will triple check to be sure though.
I have tried multiple SD cards. According the the Humminbird/JOhnson Outdoors website, the SD card has to be “Class 10” and it has to be 32gb or less. I have several and have tried all of them. I’ve tried doing “quick format” and a full format on them, but with no luck.
I’ve opened a support case with Humminbird, we’ll see what they have to say.
Thanks!
Chris