Putting this up here in case anybody wants to try their luck.
If anybody wants to try to revive our old FS510 Card let me know. It only worked for less than 3 years and broke, so we had to buy a new one (long story). I have tried formatting it multiple times, but basically at bootup our GTN650xi would say "FS510 powering on" and it would stay that way without changing. The SDCard portion of it does work and shows up as a storage drive, but the important part (wifi/bluetooth) doesnt, our shop also tried with no luck.
Can ship it for free, if you revive it, let us know for kicks and then you get a FS510 for free

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-David