My gopro hero 5 would tell me SD card error VERY frequently even though I have the recommended SD card. I updated the firmwear 3 times and reset the camera. But nothing worked. I did manage to get 1/3 of the videos I took to work without an error, and I tried to download the videos to my mac, and it didn't work. I downloaded them on the quik app on the computer, but when I tried to use GoPro studio to edit the videos, they are fuzzy and choppy. I have a GoPro Hero 3 and had 0 problems with it. I returned the Hero 5 camera but would still like to do something with the videos that I took. Overall terrible experience with this camera.
