I bought this two-pack 6 months ago, and used them in a cheaper action camera. They worked fine. I just purchased a GoPro Hero 9, and the camera will not turn on with either of the two cards in. I tried formatting them on the PC, as GoPro suggested, but no luck.One note: One time, the camera did turn on, but it just said "Card busy" any time I tried to do something. Disappointing because these are a great value.My old SanDisk SD card works fine.,
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