Have you tried it with a different micro SD card?
tried 2 others, error on both, but when I put any and all sd card onto my SJCam, they are all fine. Is there a way to format the GoPro like you do with a computer or sth?
Sorry, all out of ideas then :) I've only got a gopro session, so don't know what the format process is via the hero 3.
@ExTra started
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Have you tried it with a different micro SD card?