N1: Photo trigger is not available. Card is full, read-only or faulty. Check SD card. [solved]

[allanimal]

I am able to connect to the Unleashed on my Nikon D500 from my iPhone SE , and I can change camera settings, but I cannot take any pictures. I am getting an error message "Photo trigger is not available. Card is full, read-only or faulty. Check SD card."

The card is empty.
The card is unlocked.
The card works with manual operation.

A 2nd card works ok.

Why does it think my SD card is faulty? What can I do to fix this so it works with all SD cards?

[Andy]

There is a bug in the firmware that raises that error with empty SD cards. Take a picture with the camera and the error should go away.

This is a known issue and it will be fixed with the next firmware update.