On the Kr page it states this:
Memory card type
SD, SDHC (max. 32GB), SDXC via firmware update
It doesn't state that the capacity is increased in the
firmware updates, nor does it state that it is not increased. I think you may have been lucky that it did work.
Formatting it in the Mac should not have killed the card, you should be able to reformat it in camera. Resetting your camera values to default should not affect formatting. Do have access to another camera that you could attempt to reformat the card in? You may be able to remove formatting in the Mac, similar to what you can do wiping a hard drive. You might want to check the card manufacturer's website.