To the best of my knowledge, the Aura H2O Edition 2 Version 2 has fixed internal memory. The waterproofing for these devices makes using SD card in them impractical.
I don't remember any discussion on opening them, so I can't help there. For most of the Kobo device, the back snaps off. You need to slip something slim in around the seem. But, if there are visible screws that's were I would start.
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