1. Remove the battery cover and battery.
2. Slide the card holder in the direction of arrow to unlock it.
3. Raise the card holder with your finger.
4. Insert a microSD card into the holder. Make sure to check the position of the gold terminals.
5. Replace the card and card holder and gently press them, and then slide the holder in the direction of arrow to lock it.
6. Place the battery back into its compartment and replace the battery cover.
You can download the Hydro manual here there is an illustration of how to do it in there somewhere.
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