I used a 256GB SanDisk Ultra and it works perfectly.Is there any particular brand for the 256gb that is preferred? @viofo;
I just switched to a Sandisk Ultra A1 256gb card. Works like a charmThe SanDisk Ultra A1 works well, but it must be the A1 model (must say A1 on the card). The older, non A1 cards, should not be used.