I have Fiio M11, wanted to use a second SD card, but one slot (here No. 1) does not work, the card is not displayed. It shows up when I put it in slot #2. The card that was displayed and used in slot 2 is not displayed after switching to slot 1.
It sounds like hardware issue to me. Have you tried to contact Fiio for support? @FiiO is a sponsor on this forum that visit frequently. You might want to give him a PM. Otherwise:
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