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Try the new diagnostic feature that you just got now with the upgrade! Settings - Device - Advanced(on the bottom) - And on the bottom again is the diagnose app or what its called!! Should be a SD-card diagnose feature there if you just look through it.
And you've tried like everything else, like taking it out and back in, battery pull etc etc?
If so, then maybe you should downgrade your OS and see if that helps! I'm not sure at all if it does, but its worth trying if you want to try and get your mem card back
If you bought your phone brand new you might wanna go back to the shop and have a chat with them, might be covered by the warranty! If, nobody here knows a solution...
