Easy upgrade: Buy a 64GB microSD card. Insert the new 64GB microSD card into your tablet. Check size of mem card to verify that only 32GB is accessed. Now insert it into a compatible Windows computer. Perform a FAST Format on the card. Now reinsert the card into the Viking Pro. Format the card when prompted. A check of the drive size should it it is now a 64GB microSD card. When possible, I'ii check to see it 128GB works the same.