Card? or Port? Port is for connecting the H to a PC to view and adjust the different functions of the H(GUI), software, hdmi out/googles etc.
The card in the slot is used to update firmware and save files from the ST16 on to transfer to your PC, Hope that answered you questions my friend!
You can update firmware on the GUI from PC to camera USB port instead of using a sd card, I have not tried it that way, but some on here have done it that way !I'm referring to the USB port on the camera beside the SD card slot.
I've used the USB port on the H to PC for firmware update & settings, etc. But I don't recall seeing how to use the USB on the cam.
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