Two good tips for this thread-
1.) if you put the /Garmin directory on the SD card and your G3X is not prompting you to update, you may have some hidden/shadow files on your sd card that is preventing it, for whatever reason- format the card following the next step
2.) if you're not sure how to format the SDcard on your mac, goto the finder (little magnifying glass in top right corner) and type "disk utility" then select the SD card in the left menu, and select Disk Erase, it will then give you a drop down for the format type- pick FAT
3.) if you have to format a SD card with your mac, use the "FAT" format, not "ExFAT"
FAT = FAT32
ExFat = ExFat, it's not what you need
FAT16 is not supported by mac any longer
you're welcome!
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