Hi to everyone,
yesterday my SDHC card was annoying me because my M92 doesn't recognize it. I tried with 4 different models of SD cards, and only one that worked was the one i use in my nikon...So i tried to format the other card with my camera, and then they all worked. I suppose that Boox M92 has some issues when formatting external memories, but for the moment i don't care about it as long as it works.