Blend the cubed apple, the water, the flax meal, the salt, the syrup, and the cinnamon in a blender till smooth.
Pour mixture over the flax and chia seeds in a large bowl. Allow to site for three hours (or more is fine, too), till the mixture is thick and viscous. Stir in the grated apple and the pumpkin seeds.
Spread the mixture onto a Teflex-lined dehydrator sheet. It should be just shy of 1/4” thick.
Dehydrate at 115 degrees overnight (6-8 hours). Place another Teflex sheet on top of the flatbread, then gingerly invert the two and peel the original sheet off the bottom of the crackers. Score into 6-8 pieces and continue to dehydrate for another 3-4 hours, or until very crispy.