I am sorry but your SD card has been certainly corrupted by the upgrade you have done on your S7 because you were using your SD Card as Adaptable Storage.
There was a warning when you were about to start the upgrade saying:
“… if you have been using Adoptable Storage, upgrading will lead to data loss and SD Card corruption, including internal storage. …”
Chocobo had the same problem as you:
I should have been more careful….
I am happy you could read your SD Card on your PC.
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