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An idea, equipment failure isolation. (assuming you’ve got the board in a lab location) Possible combinations of the three variable 1) switch uSD and 2) switch Mayfly 3) add separate USB power supply via USB cable. Does the Mayfly always fail writing to the uSD, even with known working uSD. That could be that the uSD slot has a failure (effectively Mayfly bad). I get a white/red SD card so that I give each SD card a number on the white portion so I can track them.