I'm not convinced...
About all cards only work with fat16/fat32...
About none work with ntfs, maybe some work with exfat, but most don't.
I am not convinced you installed the firmware the right way, and it will not work if installed any different.
Since there are false labeled cards and you didn't seem to check anything...
There's a high risk you'll buy a new card to get excactly the same problems.