Looks like a factory reset didn’t help, nor was the storage full. I think your motherboard may be indeed kaput. Replacing it should get you back into business.
[guide|42107]
[product|IF300-005]
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=== Update (11/20/2018) ===
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You can try to follow [https://es.gopro.com/help/articles/how_to/Software-Update-Instructions-for-HERO3-Cameras|this guide] to update the software, which may solve your problem. I think there’s more then a software issue going on here, though.
Looks like a factory reset didn’t help, nor was the storage full. I think your motherboard may be indeed kaput. Replacing it should get you back into business.
[guide|42107]
[product|IF300-005]