Use KN-SDExplorer to back up your card and restore it to a new one. That will get you back working.

In the meantime, copy the entire contents of the card onto your computer, as an additional backup.
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Help to preserve information about Technics Keyboards.
https://TechnicsKN7000.com
https://TechnicsKeyboard.com
https://wsa1.technicskeyboards.com/
KN7000 KN6500 KN6000 KN5000 KN3000 KN2600 KN2000 KN1000 KN901 KN800 P50 WSA1 AX7 GA3 PR804 Liverpool Tyros 3