There is a more automated way to a solution. A few guys over a reddit helped me, thanks to Luke210, homerghost, and moddingmike.
If you’re comfortable using the Mac terminal, there’s fatsort:
Once installed, plug the SD card in, and type:
diskutil list
Find the SD card in the list of drives and note the disk #, for example: disk2s1
Then type:
diskutil unmount /dev/disk2s1
Now run the program: sudo fatsort /dev/disk2s1
Be sure to use diskutil to unmount the drive and not the eject button in the finder, otherwise fatsort won’t work.