SD card for sure formatted to FAT32?
What happens when you remove the card and press the nav button?
Edit:
found an few old discussions, the man had the same problem as yours. In the end it turned out that his SD slot was damaged. Settings are OK.
Btw, to change path tap on this button:
Spoiler: pic 1
then browse:
Spoiler: pic2
finally confirm on OK button
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